Wera Series 2 840/2 Z Sheet Metal Bit, Hexagon 6mm, 5/16" 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 wide and Hex-Plus, for Hexagon socket screws, 5mm x 5/16"Drive For hexagon bit holders and direct drives, with 30mm blade Wera Hex-Plus technology prevents rounding of screw recess and transfers up to 20% more torque Manufacturer Part #: 05057520001