Removing a nut or bolt with rusted or rounded head can be a real pain. The Kincrome Bolt Extractor Set offers a quick and simple solution to the problem. This set covers a range of common metric sized sockets from 8mm to 19mm. This kit is made from high quality, chrome plated SCM-435 Chrome Molybdenum Alloy to provide excellent strength and durability. These 3/8" drive sockets are extremely versatile and can be used with either a hand ratchet or even an impact wrench. Thanks to Kincrome's unique design, this bold extractor set will remove up to 85% of rounded fasteners with ease.