The Wera BTZ BiTorsion Extra Tough Bits are harder wearing than standard bits, and are ideal for difficult screwdriving jobs e.g. in sheet steel or metal. Hard, reliable bit which ensures significantly extended service life over standard bits. When used with a BiTorsion Rapidaptor, The two unique Torsion zones, one in the bit and one in the holder, work together to absorb peak loads placed on the bit, significantly extending bit service life. Suitable for DIN 3126-D 6.3, ISO 1173 bit holders. Use with all combi and drill drivers, for impact tools, use Impaktor Bits. Drive: Standard 1/4in Hexagon.Size: PZ2.Length: 25mm. Pack Quantity: 10.