Bit-Box 20 BTZ TX20. BiTorsion bits for inner Torx® screws in a practical Bit-Box. With an elastic torsion zone, which transfers kinetic energy during peak loads. With soft BiTorsion zone to prevent the bit tip from deforming under high loads. This extends the life of the product considerably. With the ''Take it easy'' tool finder: Colour coding according to profiles and size stamps. Tempered, for universal use. 1/4'' hexagonal, for holders according to DIN ISO 1173-D 6.3.