This 3/8-inch (about 1.9 cm) damaged bolt extractor is heat-treated alloy steel, very strong, chrome-plated, not be damaged by high-intensity work, while lubricating the internal rotating threads to provide better rust and wear protection. This damaged bolt and stud extractor tool has a 3/8-inch drive and can be used with a manual or pneumatic impact wrench and ratchet to quickly and easily remove damaged bolts and studs from 1/4-1/2-inch (6-12 mm) studs. Traditional bolt extractors have limited sizes and varieties, wasting your space and increasing your costs, while our bolt extractors are universally designed and automatically adjust in size, which can easily clamp damaged bolts for stripping, saving your valuable time and cost. This stud removal tool is easy to use and can help you breaks, whether it is an exhaust manifold, plug, broken or damaged bolts, painted or rusted fixing screws, all of which can be effectively removed. No need to think about using this stud removal tool; place the stud extractor over the stud and turn the bottom hexagonal nut counterclockwise to tighten the jaws. Once the jaws are firmly clamped onto the broken bolt or stud, continue to turn the stud counterclockwise until it is removed., Weight: 367.15 pounds, Manufacturer: IJSDNVJNDX