Screwdriver Bits - Professional Our Professional Grade screwdriver bits are made from a special S2 alloy steel, which is heat-treated for maximum strength and durability.
	Screwdriver Bits - Industrial Our Industrial Grade screwdriver bits are made from a special alloy steel, which is heat treated for maximum strength and durability. Hardness is 60/62 R.C. surface through to core. Torque test is 190/145 lbs. with a 1/4” hex shank. Our two piece square recess bit provides tighter tolerances and superior performance.
	Packaged Screwdriver Bits