This Damaged Bolt and Stud Extractor Tool has a 3/8-inch drive and works with manual or pneumatic impact wrenches and ratchets to quickly and easily extract damaged bolts and studs for 1/4 - 1/2-inch (6 - 12 mm) studs This 3/8-inch Damaged Bolt Extractor is heat-treated Metal that is extremely strong and chrome-plated so that it won't be damaged by high-intensity work, as well as lubricating the internal rotating threads to provide better protection against rust and wear Traditional bolt extractors are limited in size and variety, wasting your space and increasing your cost, while our bolt extractor adopts a universal design with automatic size adjustment, which can easily clamp damaged bolts for stripping, saving you valuable time and cost This stud removal tool is easy to use and will help you get more breaks, whether it's exhaust manifolds, fuel plugs, broken bolts, or broken, painted, or rusted setscrews, all can be effectively removed Using this stud removal tool requires little thought; place the stud extractor on the stud and tighten the jaws by turning the bottom hexagonal flat nut counterclockwise. Once the jaws are firmly clamped on the broken bolt or stud, continue to turn the stud counterclockwise until it is removed Colour:As Shown Material:Metal Package Contents: 3PCS x Stud Extractor Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.