Wera screwdriver bit made from high quality materials and have a unique hardening processes which makes them incredibly hard wearing and the first choice for the professional. This range of bits are ideal for use in metal applications; screwdriving self-tapping screws into sheet metal or where fasteners are driven into material to a dead stop. Hard wearing & longer life due to the unique precision hardening process Extra tough and ideal for screwdriving into metal Use the Wera BiTorsion Bit Holder to increase the service life of the bit 1/4" Hex