1Stud Remover Description: 3/8in/0.95cm drive damaged bolt extractor fits most drive tools and can be used with hand or pneumatic impact wrenches (not include) and ratchets as well as adjustable wrenches and flat wrenches (not include). 2Multi Purpose: This stud removal tool is very practical, whether it is exhaust manifold, fuel plug, broken bolts, or damaged, painted, rusted fastening screws can be effectively removed, but due to the excessive clamping force, minor wear may occur on the threaded surfaces. 3Specially Designed: This is a well designed auto adjusting stud extractor that easily clamps damaged studs for stripping, saving you valuable time and it is really useful tool for your toolbox. 4Easy to Operate: Place the stud extractor on the stud and turn the bottom hex flat nut counterclockwise to tighten the jaws. With the jaws firmly gripping the broken bolt or stud, continue to turn the stud counterclockwise until it is removed. Then loosen and separate in a clockwise direction. 5Premium Material: Adopting durable heat treated alloy steel, with a chrome plated finish, stud removal tool won't be damaged by high intensity work, and adds lubricant to the internal rotating threads for better rust and wear protection.