1Accurate Design: The accuracy of the chamfered edge of each left hand drill bit is designed to help remove damaged studs, bolts, socket head cap screws and joints faster. 2Removal Of Damaged Screw: The bolt extractor is used to remove damaged screws, whether working on wood or metal. 3Excellent Durability: The screw extractor is made of impact resistant CR MO steel (chromium molybdenum steel) and HSS material, which provides excellent durability and corrosion resistance and is not easily damaged. 4Easy To Carry: Put the screw extractor in a plastic case for easy storage. You can take it anywhere in the world, whether it's for car repairs or everyday use as a bolt remover, which can provide you with great convenience. 5Multiple Sizes: Left hand drill bits for sizes19/64inch, 1/4inch, 3/16inch, 5/32inch, 1/8inch. Screw extractors include 1#, 2#, 3#, 4#, 5#. Impact drives for a variety of operational applications.