Wera 05066120001 867/1 BTZ 1/4'' Hex Torx Insert Bits are high quality bits for Torx screws. Wera 867/1 BTZ 1/4'' Hex Torx Insert Bits are designed with an elastic torsion zone where kinetic energy is diverted from peak loads, and a softer BiTorsion zone to prevent the bit tip from twisting under peak loads which greatly extends the product service life. This provides the best possible durability together with the matching holder. Wera 867/1 BTZ 1/4'' Hex Torx Insert Bits are tough and viscous for universal use, feature a 1/4'' hex drive and are suitable for holders as per DIN ISO 1173-D 6.3.