Wera 05060055001 855/4 TH 1/4'' Hex Pozidriv Power Drive Bits are high quality bits for Pozidriv screws. Wera 855/4 TH 1/4'' Hex Pozidriv ® Power Drive Bits are designed with torsion zone where kinetic energy is diverted from peak loads which greatly extends the product service life. Wera 855/4 TH 1/4'' Hex Pozidriv ® Power Drive Bits are particularly hard for semi-hard materials, feature a 1/4'' hex drive and are suitable for holders as per DIN ISO 1173-F 6.3.