5 1/2" Ring Clamp For Ring & Jewelry Repair. This is a new ring clamp and bench pin. Well made clamp makes working on rings easier. The handle features a cushion grip with excellent properties, maximum support, flexibility, lessens fatigue and increases productivity. The jaws can open up as large as 3/4" (19 mm). The ring clamp measures approximately 5 7/8" x 1 11/16" (149 x 43 mm). The bench pin measures approximately 5 3/8" x 2" (137 x 51 mm).