Wera Series 1 856/1 TZ ACR Special Design Bit, Pozidriv PZ 1, 1/4" Drive Wera Bits are designed for the most demanding applications in trade and industry. They are designed to have the ability to transfer high torque loads, safe to use and extremely durable. Made with the Torsion form for minimizing premature wear. The greater elasticity of tough viscous bits prevents premature breakages of the tip of the tool. Features Wera's tough viscous and torsion form design, for Pozidriv screws, PZ 1 x 1/4" Drive For hexagon bit holders and direct drives, with 25mm blade Wera's Anti Cam-Out Ribs (ACR) are designed to prevent bits from slipping out Manufacturer Part #: 05056937001