Wera 05059924001 855/4 BTZ 1/4'' Hex Pozidriv Power Drive Bits are high quality bits for pozidriv screws. Wera 855/4 BTZ 1/4'' Hex Pozidriv ® Power Drive Bits are designed with torsion zone where kinetic energy is diverted from peak loads and softer BiTorsion zone to prevent the bit tip from twisting under peak loads, greatly extending the products service life. Wera 855/4 BTZ 1/4'' Hex Pozidriv ® Power Drive Bits are tough viscous for universal use, feature a 1/4'' hex drive and are suitable for holders as per DIN ISO 1173-F 6.3.