5-piece bold extractor set of hardenen, shock-resistant tool steel. Center punch and drill a straight hole at least 3/8\" deep into the bolt. The Super Outs are hammered-in and thus cut their way into the bolt, following the drilled hole, straight and without wedging or further tightening of the jammed bolt. Then remove bolts with a wrench. Inc. extractors for 1/4\", 5/16\', 3/8\", 7/16\" and 1/2\" bolts