... Tools bit of air power screwdriver bit Specificationsscrewdriver bit,drill bit power bit 1. Material: S2,Cr-V 6150, etc. ... any other special finishes be required by customers 4.Type:single head, double head, head with round neck,non-magnetic and magnetic 5 ... .Head types:PH, PZ, slot, Torx, square, hex, hex-plus, Z- ...