High quality stainless steel bits for internal torx screws. Wera stainless steel tools are made of stainless steel, which avoids the unsightly foreign rust. With torsion zone: Torsion bits cushions torque peaks in the torsion zone. Premature wear is avoided, the service life of the bit is increased. 1/4″ hexagon, suitable for holders according to DIN ISO 1173-D 6.3.