1000EF 8 PC Set

DRILLCO 1000EF 8-Piece S&D Drill Bit Set — Large-Diameter Drilling with 1/2" Reduced Shank

The DRILLCO 1000EF 8-piece set is a spade-and-drill (S&D) imperial drill bit set designed to extend the large-diameter hole-making capacity of a standard 1/2" portable drill chuck. Covering sizes from 9/16" to 1" by 16ths, the set is built for contractors and trades professionals who need to drill large-diameter holes in low to medium tensile strength materials using handheld or fixed-spindle machines. All eight bits share a common flute and overall length, minimizing setup adjustments during tool changes on the job. Made in the United States from general purpose high speed steel (HSS) with a black and gold surface treatment, these drills are engineered for reliable performance across a wide range of everyday drilling applications.

Technical Specifications

Available Items

Unlike standard jobber-length drills limited to smaller chuck capacities, the 1000EF series uses a 1/2" reduced shank with 3-flats to unlock large-diameter drilling on any standard 1/2" portable drill chuck. The shared flute and overall length across all eight bits in the set means minimal re-adjustment between tool changes, a practical advantage on production or multi-hole jobs. The black and gold surface treatment provides better lubricity and corrosion resistance compared to a plain bright finish or standard black oxide treatment.

Key Features & Benefits

1/2" Reduced Shank with 3-Flats

The reduced shank allows drill sizes from 9/16" to 1" to fit into a standard 1/2" portable drill chuck, expanding the size range capacity without requiring a larger machine. The three flats on the shank provide a more secure grip in handheld power tools, reducing slippage under load.

135° Self-Centering Split-Point

The 135° split-point geometry is self-centering, eliminating the need for a center punch on most surfaces and reducing bit walk at the start of a hole. This design also enables faster cutting compared to a conventional 118° point, improving productivity on repetitive drilling tasks.

General Purpose HSS Construction

Made from high speed steel, these bits are suited for drilling low to medium tensile strength materials including mild steels, aluminum, and other non-ferrous materials. HSS is the most widely used tool material for general purpose drilling, offering a reliable balance of toughness and wear resistance.

Black and Gold Surface Treatment

The black and gold finish provides higher lubricity than a bright or black oxide finish, reducing friction and heat buildup during drilling. This treatment also offers better resistance to corrosion and breakage while reducing chipping and flaking, extending tool life in demanding field conditions.

Common Flute and Overall Length Across the Set

All eight bits in the set share the same flute and overall length, so operators spend less time adjusting drill press depth stops or handheld tool settings between bit changes. This consistency is especially valuable on jobs requiring multiple hole sizes in sequence.

Made in the United States

The 1000EF set is manufactured in the United States, which can be a procurement requirement on certain commercial and government construction projects.

Common Applications

Drilling Large-Diameter Holes with a Standard 1/2" Chuck

The reduced shank design allows contractors to drill holes from 9/16" to 1" diameter using a standard 1/2" portable drill chuck, eliminating the need for a larger or specialized machine on the job site.

Drilling in Low to Medium Tensile Strength Materials

The HSS construction and black and gold surface treatment are optimized for low to medium tensile strength materials, making these bits well-suited for structural steel, mild steel, and similar substrates commonly encountered in construction and fabrication.

Fixed Spindle Machine Operations

The set is also rated for use in fixed spindle machines such as drill presses, where consistent hole diameter and depth are required across multiple workpieces.

Multi-Size Hole Drilling with Minimal Setup Changes

Because all bits in the set share a common flute and overall length, they are practical for jobs requiring several different hole sizes without repeated machine reconfiguration.

Product Documents

• Safety Data Sheet (SDS)
• Drillco Product Linecard

Safety Data Summary

Hazard Information

• During normal operation, high speed steel drill bits do not present inhalation, ingestion, or other chemical hazards.
• Grinding, cutting, machining, burning, or welding these tools may release dusts, fumes, or vapors that can present health hazards if exposure limits are exceeded.
• Excessive inhalation of metallic fumes and dusts may cause 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.
• Chromium (present 0–5% by weight) is listed as a carcinogen by NTP and OSHA; various forms of dermatitis, upper respiratory tract inflammation/ulceration, and possible nasal/lung cancer are associated with chromium exposure.
• Tungsten (5–10% by weight): some evidence of pulmonary involvement such as cough.
• Vanadium (0–5% by weight): eye and respiratory tract irritant.
• Cobalt dust (if present from grinding) is reported as the most probable cause of respiratory diseases including occupational asthma and interstitial fibrosis.
• Skin contact with dust can cause irritation or allergic skin rash due to cobalt sensitization.
• Fine metal particles produced when ground or sawed can burn; high concentrations in air may present an explosion hazard.
• NFPA Hazard Rating: Health 1; Flammability 0; Reactivity 0.

Personal Protective Equipment

• Wear safety glasses or goggles with side shields; do not wear contact lenses when handling these materials.
• Cloth or leather gloves are recommended when contact with dust or mist is likely.
• Use an appropriate NIOSH-approved respirator if airborne dust concentration exceeds the applicable PEL or TLV.
• Hearing protection may be required.
• Always use machine guards and wear protective clothing to prevent injury in the event of tool breakage.
• Employer should provide an eye wash station within the immediate work area for emergency use.

Safe Handling

• Use only with local exhaust ventilation adequate to limit personal exposure to airborne dust below PEL or TLV levels.
• Clean up using methods that avoid dust generation: vacuum with appropriate filters, wet dust mop, or wet clean-up.
• Wash hands thoroughly after handling and before eating or smoking; wash exposed skin at end of work shift.
• Do not shake clothing, rags, or other items to remove dust; remove dust by washing or vacuuming with appropriate filters.
• Store in a dry place in a manner that prevents accidental environmental contamination from traces of industrial lubricants or wetting oils.
• Soiled clothing should be laundered separately.
• Incompatible materials: strong acids, strong oxidizers.
• For powder fires: smother with dry sand, dry dolomite, ABC-type fire extinguisher, or flood with water; do not release runoff from fire control to swales or waterways.

Frequently Asked Questions

Q: What chuck size is required to use these drill bits?
A: All bits in the 1000EF set have a 1/2" reduced shank, so they fit into any standard 1/2" drill chuck on a portable drill or fixed spindle machine.

Q: What is the full size range covered by this 8-piece set?
A: The set covers 9/16" to 1" in diameter, progressing by 16ths of an inch, for a total of eight bits.

Q: What materials are these drill bits designed to cut?
A: The 1000EF series is designed for drilling in low to medium tensile strength materials. General purpose HSS is suitable for materials including mild steels, aluminum, and other non-ferrous materials.

Q: Why does this set use a 135° split-point instead of a 118° conventional point?
A: The 135° self-centering split-point eliminates bit walk at the start of a hole without requiring a center punch, and allows for faster cutting. It is particularly effective for handheld drilling and on curved surfaces.

Q: What is the benefit of the black and gold surface treatment on these bits?
A: The black and gold finish increases lubricity compared to a bright or black oxide finish, which reduces friction and heat during drilling. It also provides better resistance to corrosion and breakage and reduces chipping and flaking.

Q: Why do all bits in the set share a common flute and overall length?
A: A common flute and overall length across all eight bits means minimal adjustment is needed when changing between sizes during a job, reducing downtime and setup time on multi-hole or multi-size drilling tasks.