Wood Ring Clamp for Jewelry Making - SFC Tools - 48-125 Perfect for holding rings and other small items while you file, polish, or do other work on them. It has one round side and one flat side, both with leather-lined jaws. The wooden wedge can be driven into either end, after the ring is place in the jaws, to tighten the clamp and hold it securely. The clamp is hardwood with steel hinge construction. Measures 6 x 1.63 x 1.5 (15.2 x 4.1 x 3.8 cm) without wedge.