Check the listing for details. 1/4" to 3/4" Stud Extractor Screw Remover for Broken,Rounded,Rusted Studs & Bolt. Condition: New. Listed at 18.31 USD. Item number: AR5166Product descriptions: Type： Bolt Extractor Color: Silver Material: Steel Product features: Stud Remover Tool is for removing rusted broken stripped, smooth, threaded or seized studs, bolts and the like from 1/4 inch to 3/4 inch diameter (Ø6mm to 19mm); The cam type stud remover has an concentric cam to grip on the rusty stud. The knurled roller uses cam action to automatically close to the right size and grip the stud tightly for easy removal. The knurled roller is considered as a linkage between drive handle and stud which minimizes the damage to threads during the whole rotation This Stud Extractor uses with 1/2-inch Drive Ratchet handle or Flex HandlePackage included: 1*Stud Extractor Screw Remover