Wera Series 4 851/4 TZ Sheet Metal Bit, Phillips PH 2, 1/4" Drive Features Wera's tough viscous and torsion design, for Phillips screws, PH 2 x 1/4"Drive For hexagon bit holders and direct drives, with 50mm blade For AEG, ARO, Atlas-Copco, Biax, Black & Decker, Bosch, Buckeye-Tools, Chicaco Pneumatic, Cleco, Deprag, Desoutter, Gardner-Denver, Hios (Ferra-Tools), Hitachi, Ingersoll-Rand, Iwema (Fuji Air Tools), Keller, Makita, Mall, Metabo, NPK-Air Tools, Pneutec, Rockwell, Rotor Tool, Skil Tool, Stanley, Thor Power-Tool, Tohnichi, Uryu (UPT-Weiler), Van Dorn, Virax, and Wolf 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