This 4-piece set of CRAFTMEMORE Shackle Screw Rings is perfect for key chains, key fobs, bracelets, paracord, and leather craft. The 8mm (5/16") antique brass rings feature an inside length along the screw pin of 5/16" (8 mm) and an outside width of d-ring of 11/16" (18 mm). The diameter of the pin is 3mm. The large size has an inside length along the screw pin of 3/8" (10 mm), an outside width of d-ring of 7/8" (23 mm), and a diameter of the pin of 4mm. With this set, you can easily create beautiful and unique accessories for yourself or as a gift. Visit CRAFTMEMORE's Storefront on Amazon for more bag and leather craft accessories.