Wera Tools - Bit-Box 20 BTZ PZBiTorsion Bits for Pozidriv screws in a practical Bit Box. Come with a torsion zone where kinetic energy is diverted to when peak loads prevail: this significantly prolongs the product service life; with ""Take it easy"" Toolfinder: colour coding according to profile and size stamp; extra hard design; 1 4"" hex, suitable for holders as per DIN ISO 1173 D 6. 3. Features Suitable for Pozidriv screws BiTorsion zone to absorb peak loads Considerable