Usage Tips:This 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 bolts and studs from 1/4-1/2-inch (6-12 mm) studs. This 3/8-inch (about 1.9 cm) bolt extractor is heat-treated alloy steel, very strong, chrome-plated, will not be by high-intensity work, while lubricating the internal rotating threads to provide better rust and wear protection. 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 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, fuel plug, broken or 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. Colour:As Shown Material:steel Package Contents: 1 set x stud extractor 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.