... screwdriver bits 1. S2 Steel 2. Sand blasting 3. Different size 4.58-60 hardness 1.Item: impact driver bits, ... screwdriver bits, power bits, pneumatic power bitsS2 material4. finishing: Sand blasting5.Wide range of Tips selection:1)Phillips,Slotted,Torx ... Wide range of Tips selection3)Wide range of Coating selection:Sand blasting, titanium,Chrome electro-plating, manganese hypophosphite both them ...