1/4" double end screwdriver bits 1.S2 material 2.65mm,75mm ... 58-61degree hardness 1,1/4" double end screwdriver bits 2,Application: screwdriver bits, power bits, pneumatic power bits3,S2 ... Slotted,Torx,Pozidriv,Quadrex,Frearson,Sockethead,Square recess,Torq-Set,MorTorq,Tri-Wing,Triple Square are available5,Wide range ... 18-0860PH1X14518-0867PH2X24518-0878PH3X345 1/4" popular double head screwdriver bits