Working principle: It has one round side and one flat side, both with jaws. The wooden wedge can be driven into either end, after the ring is place in the jaws, and you can tighten the clamp and hold it securely.Application: the wooden ring clamp can be use for pressuring to gripping end of ring or other circle or loop clamp.but it didn't hurt your jewellery, Great for holding rings and other objects while filing, grinding and polishingSuitable for: The jewelry clamp is a basic tool for every bench Jeweler and others who may be making jewelry or doing repair work on Jewelry.Delivery Quantity: 1pc,Package Contents: Only the above package contents, excluding other products.Size: clip 150x40mm, cork 105mm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Color: wood color(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)