for removing bare, rusted, broken or smooth studs. The stud extractor is designed to be used with a 3/8 inch square drive impact wrench. < p>It will work effectively with smooth, broken, rusted, stripped and smooth studs, from within 9.5mm. Made with a chrome vanadium body with chrome-molybdenum jaws and removes quickly broken and damaged threaded studs. The hex drive can be a driver with a wrench, ratchet or impact tool. Product Description specification Color: silver+black Scope: within 9.5mm Material: metal Include: 1x Stud Puller Only the above package, products are not included. Note: Light reflection and different displays may cause the the item's color in the a little different from the real thing. The allowable measurement error is +/- 1-3 cm.