3-piece VARIO twist drill set with the sizes #F, 5/16 inand 27/64 in High strength tool steel for long tool life (64 HRC), special impact wrench-compatible cutting geometries, and a TiAlN (titanium-aluminum-nitride) coating.
Features
High strength TiAlN (titanium-aluminum-nitride) coating
Low wear and low friction and are heat-resistant
Suitable for the following material: unalloyed and alloyed steels of up to 130 ksi, aluminum, and brass