Wera 05060005001 855/4 TZ 1/4'' Hex Pozidriv Power Drive Bits are high quality bits for pozidriv screws. Wera 855/4 TZ 1/4'' Hex Pozidriv ® Power Drive Bits are designed with torsion zone where kinetic energy is diverted from peak loads which greatly extends the products service life. Wera 855/4 TZ 1/4'' Hex Pozidriv ® Power Drive Bits are ductile and tough for hard materials, feature a 1/4'' hex drive, and are suitable for holders as per DIN ISO 1173-F 6.3.