Phillips tip with ACR (Anti cam-out rib system) reduces stripping and damage to the screw. Fitted with a magnetic tip which increases productivity and eliminates frustration when working at awkward angles or in tight spaces. Cold forged from premium shock-resisting S2 tool steel with a hardness of 58-62HRC for superior strength and torque tested to exceed DIN standards by up to 330%. These have 1/4" hex shank with power groove for use in impact drivers and quick change adapters.