Features and Benefits:Includes 5 Metric BOLT BITER Extraction Sockets and 2 Impact Adapters;Bi-directional design for removing or tightening damaged fasteners;Tapered entry enables socket to easily seat on a damaged fastener;Square drive with hex base for use with impact gun, ratchet, wrench, or pliers;Chrome molybdenum alloy steel (Cr-Mo) for exceptional strength and long lasting durability;Bolt Biter™ is the revolutionary new extraction socket system from GEARWRENCH. We talked with auto mechanics and industrial techs to learn what they hated about existing extraction sockets. Bolt Biter redefines extraction and solves all of their frustrations.