1/4" double end screwdriver bits 1.S2 material 2.65mm,75mm and different size 3.58-61degree hardness 1,1/4" double end screwdriver bits 2,Application: screwdriver bits, power bits, pneumatic power bits3,S2 material4,Wide range of Tips selection:Phillips,Slotted,Torx,Pozidriv,Quadrex,Frearson,Sockethead,Square recess,Torq-Set,MorTorq,Tri-Wing,Triple Square are available5,Wide range of Coating ...