H5/16" Hex driver bits 1. S2 material 2. size is different 3.58-61 degree hardness 4.used for pneumatic tools Item: H5/16" Hex driver bits,screwdriver bits, power bits, pneumatic power bitsApplication: screwdriver bits, power bits, pneumatic power bitsMaterial: Industrial grade S2 steel.Wide range of Tips selection: Phillips,Slotted,Torx,Pozidriv,Quadrex,Frearson,Sockethead,Square recess,Torq-Set ...