Clear Hard Acrylic Plastic Coin capsule Display Case per dozen. Coin display holders come in two pieces, the base and the cover. To use, simply place a coin in the base and snap the cover on. Inside 2.2mm. 32mm is 1 1/4 inches. 30mm equals 1 1/8". 40mm x 3mm equals 1 1/2" Tight fit centers coin. Protests coins in mint condition. You could glue plastic case together for outside use in memorial. Makes it a gift item.