855/1 BTZ bits, PZ 3 x 25 mmBiTorsion bits for Pozidriv* screws with torsion zone into which kinetic energy is dissipated during peak loads. This significantly increases the product life. Extra-hard design. 1/4", hexagonal, suitable for holding tools as per DIN ISO 1173-D 6.3. *Pozidriv = registered trademark of the company European Industrial Service Ltd.