Wera Torsion Extra Hard Pozi Screwdriver Bits

The Wera 855/4 TH Torsion Extra Hard Pozi Screwdriver Bits are professional-grade PZ3 bits engineered to handle demanding fastening applications with reduced wear and extended service life. At the core of these bits is Wera's Torsion zone design, which diverts kinetic energy away from peak loads during use. This absorbs impact stress rather than concentrating it at the tip, significantly reducing the risk of premature wear and breakage — particularly valuable when working with semi-hard materials or using power tools at high torque. The extra-hard construction makes these bits well-suited to repetitive fastening tasks where standard bits quickly deteriorate. With a 1/4" hexagon drive conforming to DIN ISO 1173-F 6.3, they are compatible with a wide range of bit holders and power tool chuck systems (Wera connecting series 4).