High-quality bits made of stainless steel for internal TORX screws. Wera stainless steel tools are made from stainless steel, which prevents unsightly foreign rust. With a torsion zone: In torsion bits, torque peaks are cushioned in the torsion zone. This prevents premature wear and extends the lifespan of the bit. 1/4" hexagon, compatible with holders according to DIN ISO 1173-D 6.3.