Check the listing for details. Wera 066420 #4 x 25mm Square Bit. Condition: New. Listed at 9.46 USD. Item Details Wera 066420 #4 x 25mm Square Bit (Manufacturer provided photo may slightly differ from actual product.) Wera Series 1 868/1 Z Sheet Metal Bit, Square-Plus # 4 Head x 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. The greater elasticity of tough viscous bits prevents premature breakages of the tip of the tool. Features Wera's tough viscous design, for Square socket head screws, # 4 x 1/4" drive For hexagon bit holders and direct drives, with 25mm blade Wera Bits for hard materials (e.g. metal sheets or structures) prevent premature breakages of the tip, created by the large amounts of peak torque generate to the screw and bit Manufacturer Part #: 05066420001