28 Pc. 1/4" & 3/8" Drive Bolt Biter™ Impact Extraction Socket Set Bi-Directional design for removing or tightening damaged fasteners. Tapered entry enables socket to easily seat on a damaged fastener. Dual sized sockets designed to work with both SAE and Metric fasteners. Square drive with hex base for use with impact , ratchet, wrench, or pliers. Chrome Molybdenum Alloy Steel (Cr-Mo) for exceptional strength and long lasting durability. High-Visibility -etched markings provide quick size identification. Black oxide coating provides superior corrosion resistance. Up to 10x longer impact life vs. competition. Up to 5x greater torque output vs. competition. Minus-Size sockets fit a wider range of damaged fasteners 84784 No -