Assorted Challenge Coin Adopter Rings for Gaus-usa 2 Inch Displays [6 Rings] They fits inside Gaus-USA coin display's 2 inch coin aperture Designed to display a verity of 6 following challenge coins 1.76"-1,74"-1.69"-1.65"-1.515" And 1 3/4" Wide Small Pentagon Coin Made In USA Measure your coin before ordering. all ring ODs are 2.040", .177 thick