We love big clasps. Each D ring has a slot for your leather, mutistrand, or seedbead creations. Use a jumpring or short length of chain and rings to attach the supplied toggle bar to one of the D rings. D Rings measure 14 x 15mm with an inside diameter of 6 x 2.25mm. The bar measures 3 x 20mm, it's loop has an inside diameter of 2mm. Finished in a satin rhodium plate.