Wera Series 1 842/1 Z Sheet Metal Bit, Ball head Hexagon 5mm Head x 1/4" Drive Features Wera's tough viscous design and ball head, for hexagon socket screws, 5mm x 1/4" drive For hexagon bit holders and direct drives, with 25mm blade For Fein, Bosch, Holz-Her, Metabo, and Lecurex hexagon drives 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 Limited Lifetime Warranty, German Engineered