Wide Compatibility- The bolt extractor set (#0/#1/#2/#3/#4) works with any drill and any size screw or screw. Complete bolt removal tool kit easy to pull out and can meet your individual needs. Hardness 63hrc - This damaged bolt removal tool kit is made of HSS 4341 alloy steel (the hardness is 63hrc), durable for extracting stripped, broken, stuck or damaged screws. High Quality- The stripped screw extractor is made of 4341 high speed steel. High hardness, durable and easy to clean. remove damaged screws. Easy to use - a drill has two different bits, one drill head needs to make a hole in the broken screw head so that the other can be removed, the another drill head is used to remove the screw or bolt. Provides a 2-in-1 solution- The two-step solution means you don't have to use more than one tool to remove damaged or stubborn screws. All you have to do is pierce the screw with the drill bit before flipping it over and reattaching it to the drill bit of your choice. Designed with two drill bits- These are steel screw extractors high speed also built with two bits to facilitate the mining process. One is used to drill a hole in the center of the snap with the end of the drill bit, the other is used to remove screws or bolts. Wide Application- The Puller and the damaged screw remover can be widely used in household repair work, telecommunications, automobiles or machinery. and must have tool for every handyman, auto or boat mechanic, contractor, carpenter, woodworker, or anyone who constantly works with screws and bolts. Comes in a plastic box for easy transport.