High quality bits out of stainless steel for Pozidriv screws. Wera stainless are made out of stainless steel which prevents the formation of unsightly extraneous rust. Come with Torsion zone: Torsion bits take-up torque peaks and absorb them in the Torsion zone. This prevents premature wear and extends the service life of the bit. ¼" hexagon, suitable for holders as per DIN ISO 1173-D 6.3.