DurableThe screw and bolt extractor set is made of premium high speed alloy steel (HSS 4341), sturdy, durable, very high strength, not easy to damage, higher efficiency and longer service life. 5Pcs Bolt Extractor SetThis damaged screw extractor kit#0/#1/#2/#3/#4works with most drills and all sizes of screws or bolts (3-12mm), and there is a box to store these screw extractors, very portable and convenient. Easy to UseIt is a very simple step. Simply select a drill bit smaller than the damaged screw and you can easily remove the damaged screw. TitaniumWe have added a layer of titanium to the screw extractor, which makes the stripped screw extractor easier to store, will not rust or corrode, and has a better appearance. Wide CompatibilityThe screw extractor set (#0, #1, #2, #3, #4) works with any drill bit and any size screw or bolt. This damaged screw extractor can remove all common sizes of damaged, stripped, or broken screws.