This 6" high-quality wooden ring clamp features leather jaws for holding rings and other objects while filing, mounting, etc. Leather jaws will not mar your materials; 15 mm maximum opening. Essential for Jewelry Repair and Jewelry Making Please contact us with any questions. Please visit our store for other great jewelry tooling items such as; Hand Stamps, Disc Cutters, Polishing Compound, Buffers, Hammers, Tweezers, Mandrels, Anvils, Vises and more! Thanks for Looking!