{"product_id":"200lh-29-pc-left-hand-drill-set","title":"200LH 29 PC Drill Set","description":"\u003ch2\u003eDRILLCO 200LH 29-Piece Left Hand Drill Set — Counterclockwise Drilling for Broken Bolt Removal\u003c\/h2\u003e\n\u003cp\u003eThe DRILLCO 200LH 29-piece left hand drill set is a general-purpose High Speed Steel (HSS) drill set engineered for counterclockwise drilling operations. It is designed for use in close-center multiple spindle gear-driven drilling heads where adjacent spindles operate alternately left and right hand, as well as in left hand screw machines. The set is also a practical solution for drilling out broken bolts, where the left-hand flute direction can engage and back out a fastener during the drilling process. Covering a size range of 1\/16 to 1\/2 inch by 64ths, this 29-piece set addresses the full range of jobber-length drilling needs in a single kit.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eDRILLCO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem #\u003c\/td\u003e\n\u003ctd\u003e200LH29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e045997491035\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet Size\u003c\/td\u003e\n\u003ctd\u003e29 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize Range\u003c\/td\u003e\n\u003ctd\u003e1\/16 – 1\/2 by 64T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh Speed Steel (HSS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint Angle\u003c\/td\u003e\n\u003ctd\u003e118° conventional point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBright finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlute Direction\u003c\/td\u003e\n\u003ctd\u003eLeft-handed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength Type\u003c\/td\u003e\n\u003ctd\u003eJobber length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eCounterclockwise drilling for easy removal of broken bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTechnical Tips\u003c\/td\u003e\n\u003ctd\u003eSpeed, feed, and lube are all critical to cutting tool performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eAvailable Items\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eItem #\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e200LH29\u003c\/td\u003e\n\u003ctd\u003e29PC LEFT HAND DRILL SET\u003c\/td\u003e\n\u003ctd\u003e1\/16–1\/2 BY 64T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eUnlike standard right-hand drill sets, the 200LH's left-handed flutes and cutting edges allow for counterclockwise rotation, which can simultaneously drill and back out broken fasteners — a capability no conventional right-hand drill set provides. The bright finish and 118° conventional point make this set particularly well suited to non-ferrous materials such as aluminum, while the jobber length provides the reach and versatility needed for the widest range of job-site applications.\u003c\/p\u003e\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003ch4\u003eLeft-Handed Flutes and Cutting Edges\u003c\/h4\u003e\n\u003cp\u003eThe left-handed flute geometry allows the drill to cut in a counterclockwise direction. This is essential for multiple spindle gear-driven drilling heads where adjacent spindles must alternate between left and right hand rotation, and for left hand screw machines.\u003c\/p\u003e\n\u003ch4\u003eBroken Bolt Removal Capability\u003c\/h4\u003e\n\u003cp\u003eBecause the drill rotates counterclockwise, it can engage a broken bolt or stud during drilling and back it out of the hole. This eliminates the need for additional extraction tooling in many common fastener removal scenarios.\u003c\/p\u003e\n\u003ch4\u003e118° Conventional Point\u003c\/h4\u003e\n\u003cp\u003eThe 118° conventional point geometry is optimized for rapid penetration into mild steels and free-machining materials. It is the standard point angle for general-purpose drilling and delivers reliable, consistent starts across a wide range of workpiece materials.\u003c\/p\u003e\n\u003ch4\u003eBright Finish\u003c\/h4\u003e\n\u003cp\u003eThe bright finish — a smooth, polished surface treatment with no additional coating — promotes increased chip flow and is ideal for drilling in non-ferrous materials such as aluminum. It reduces material adhesion and helps maintain a clean cutting edge during operation.\u003c\/p\u003e\n\u003ch4\u003eGeneral Purpose HSS Construction\u003c\/h4\u003e\n\u003cp\u003eMade from general-purpose High Speed Steel, these drills are suitable for most materials including low to medium strength steels, aluminum, and other non-ferrous materials. HSS is the most widely used tool material for general-purpose drilling, offering a reliable balance of hardness and toughness.\u003c\/p\u003e\n\u003ch4\u003eJobber Length\u003c\/h4\u003e\n\u003cp\u003eJobber length is the most common drill length because it provides extra reach while remaining usable in the majority of drilling applications. This makes the 200LH set a versatile choice that can be deployed across a broad range of setups without requiring specialty extensions.\u003c\/p\u003e\n\u003ch4\u003e29-Piece Set, 1\/16–1\/2 by 64ths\u003c\/h4\u003e\n\u003cp\u003eThe 29-piece set covers the full fractional range from 1\/16 to 1\/2 inch in 64th-inch increments, giving contractors and machinists a complete selection of left-hand drill sizes in a single kit. This eliminates the need to source individual left-hand drills for different hole sizes.\u003c\/p\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003ch4\u003eBroken Bolt and Stud Removal\u003c\/h4\u003e\n\u003cp\u003eThe counterclockwise cutting action of the left-hand flutes can engage and back out broken bolts or studs during the drilling process, making this set a go-to tool for fastener extraction tasks.\u003c\/p\u003e\n\u003ch4\u003eClose-Center Multiple Spindle Gear-Driven Drilling Heads\u003c\/h4\u003e\n\u003cp\u003eThese drills are specifically designed for use in close-center multiple spindle gear-driven drilling heads where adjacent spindles operate alternately left and right hand, requiring matched left-hand tooling.\u003c\/p\u003e\n\u003ch4\u003eLeft Hand Screw Machines\u003c\/h4\u003e\n\u003cp\u003eThe 200LH set is engineered for use in left hand screw machines, where counterclockwise spindle rotation demands left-handed cutting tool geometry.\u003c\/p\u003e\n\u003ch4\u003eNon-Ferrous Material Drilling\u003c\/h4\u003e\n\u003cp\u003eThe bright finish is ideal for drilling aluminum and other non-ferrous materials, where the smooth polished surface reduces chip adhesion and promotes clean cutting.\u003c\/p\u003e\n\u003ch3\u003eCompatible Materials\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNon-ferrous materials (e.g., aluminum)\u003c\/li\u003e\n\u003cli\u003eMild steels and free-machining materials (per 118° conventional point specification)\u003c\/li\u003e\n\u003cli\u003eLow to medium strength steels (per HSS material specification)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Documents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/bbz48awmftjmmy4umjo7_e5351d2d-633f-4a4f-ac1b-37946c6bb9d9.pdf?v=1793366693\" target=\"_blank\" rel=\"noopener\"\u003eSafety Data Sheet (SDS)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/cinakvujelpexceens0b_9fa76cb3-5c15-46d4-bb42-b75816b903ff.pdf?v=1793366693\" target=\"_blank\" rel=\"noopener\"\u003eDrillco Product Linecard\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSafety Data Summary\u003c\/h3\u003e\n\u003ch4\u003eHazard Information\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDuring normal operation and usage, high speed steel products do not present inhalation, ingestion, or other chemical hazards.\u003c\/li\u003e\n\u003cli\u003eOperations such as grinding, cutting, machining, burning, and welding may release dusts, fumes, or vapors which may present health hazards if exposure limits are exceeded.\u003c\/li\u003e\n\u003cli\u003eExcessive inhalation of metallic fumes and dusts may result in irritation of eyes, nose, and throat; symptoms may include metallic taste, dryness and irritation of the throat, chills, and fever persisting 12 to 48 hours.\u003c\/li\u003e\n\u003cli\u003eChromium is listed as a carcinogen by NTP and OSHA; various forms of dermatitis, inflammation and\/or ulceration of the upper respiratory tract, and possibly cancer of nasal passages and lungs are associated with chromium exposure.\u003c\/li\u003e\n\u003cli\u003eTungsten: some evidence of pulmonary involvement such as cough.\u003c\/li\u003e\n\u003cli\u003eVanadium: eye and respiratory tract irritant.\u003c\/li\u003e\n\u003cli\u003eCobalt dust is the most probable cause of respiratory diseases including occupational asthma and interstitial fibrosis.\u003c\/li\u003e\n\u003cli\u003eSkin contact can cause irritation or allergic skin rash due to cobalt sensitization.\u003c\/li\u003e\n\u003cli\u003eEye contact may cause eye irritation.\u003c\/li\u003e\n\u003cli\u003eFine metal particles produced when ground or sawed can burn; high concentrations in air may present an explosion hazard.\u003c\/li\u003e\n\u003cli\u003eNFPA Hazard Rating: Health 1; Flammability 0; Reactivity 0.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePersonal Protective Equipment\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eWear safety glasses or goggles with side shields; contact lenses should not be worn when handling these materials.\u003c\/li\u003e\n\u003cli\u003eCloth or leather gloves are recommended when contact with dust or mist is likely.\u003c\/li\u003e\n\u003cli\u003eUse an appropriate NIOSH-approved respirator if airborne dust concentration exceeds the appropriate PEL or TLV.\u003c\/li\u003e\n\u003cli\u003eHearing protection might be required.\u003c\/li\u003e\n\u003cli\u003eAlways use machine guards and wear safety glasses and protective clothing to prevent injury in the event of tool breakage.\u003c\/li\u003e\n\u003cli\u003eEmployer should provide an eye wash station within the immediate work area for emergency use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSafe Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eUse only with local exhaust ventilation adequate to limit personal exposure to airborne dust to levels that do not exceed the PEL or TLV.\u003c\/li\u003e\n\u003cli\u003eStore in a dry place; store in a manner that prevents accidental environmental contamination from traces of industrial lubricants or wetting oils.\u003c\/li\u003e\n\u003cli\u003eWash hands thoroughly after handling and before eating or smoking; wash exposed skin at the end of the work shift.\u003c\/li\u003e\n\u003cli\u003eDo not shake clothing, rags, or other items to remove dust; remove dust by washing or vacuuming with appropriate filters.\u003c\/li\u003e\n\u003cli\u003eClean up spills using methods to avoid dust generation such as vacuum (with appropriate filters), wet dust mop, or wet clean up.\u003c\/li\u003e\n\u003cli\u003eSoiled clothing should be laundered separately.\u003c\/li\u003e\n\u003cli\u003eIncompatible materials: strong acids, strong oxidizers.\u003c\/li\u003e\n\u003cli\u003eSpeed, feed, and lubrication are all critical to cutting tool performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary purpose of a left-hand drill set like the 200LH?\u003c\/strong\u003e\u003cbr\u003eA: The 200LH is designed for counterclockwise drilling operations, including use in close-center multiple spindle gear-driven drilling heads where adjacent spindles alternate left and right hand, in left hand screw machines, and for drilling out broken bolts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does a left-hand drill help remove broken bolts?\u003c\/strong\u003e\u003cbr\u003eA: Because the flutes and cutting edges are left-handed, the drill rotates counterclockwise. When drilling into a broken bolt, this counterclockwise rotation can engage the fastener and back it out of the hole during the drilling process.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What size range does the 200LH29 set cover?\u003c\/strong\u003e\u003cbr\u003eA: The 29-piece set covers 1\/16 to 1\/2 inch by 64ths of an inch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What materials are these drills best suited for?\u003c\/strong\u003e\u003cbr\u003eA: The bright finish is ideal for drilling non-ferrous materials like aluminum. The HSS construction and 118° conventional point are suited for mild steels, free-machining materials, and low to medium strength steels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What point angle do these drills use, and why does it matter?\u003c\/strong\u003e\u003cbr\u003eA: These drills feature a 118° conventional point, which is optimized for rapid penetration into mild steels and free-machining materials and is the standard geometry for general-purpose drilling applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are there any critical operating tips for getting the best performance from these drills?\u003c\/strong\u003e\u003cbr\u003eA: Yes — speed, feed, and lubrication are all critical to cutting tool performance with these drills.\u003c\/p\u003e","brand":"Drillco","offers":[{"title":"Default Title","offer_id":67903523455150,"sku":"200LH29","price":405.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0551\/8396\/6382\/files\/pj6ydqkkyghvsuhcgzyr.jpg?v=1793366696","url":"https:\/\/www.diamondtoolstore.com\/products\/200lh-29-pc-left-hand-drill-set","provider":"Diamond Tool Store","version":"1.0","type":"link"}