This Bezel is made for 39mm x 3 mm thick coins, like most 1 oz. round silver bullion and Casino Chips. This type Coin Bezel is called Screw Top. It's light weight and simple and designed to be sort of invisible when wearing the coin to highlight the coin itself. The Screw Top allows the coin to be removed and replaced easily at any time all the while keeping the very valuable condition of the coin edge very safe. Its Fine 925 Sterling Silver US made. * if you have any other coin slightly smaller that the Silver Dollar and it would be too loose inside this bezel you might be able to fit the coin by placing some paper inside the rim of the bezel. but be sure the thickness of your coin isn't larger than a silver Dollar.