Tool parts of air power screwdriver bit 1. Material: S2, Cr-V6150, etc. 2. Different sizes available 3. Finish: sandblast Professional screwdriver bits1. Product name: tool parts of screw bit, screwdriver bit, drill bits;2. Length 25,50 mm3.surface treatment: sandblasted;4. Material S2 or CRV steel for you to choose5.Phillips PH1,PH2,PH3;Slotted: 4mm,5mm,6mm,Pozi:PZ1,PZ2,PZ3;Hex 4mm,5mm,6mm;Star ...