MH-25 Single or Double-Sided Round Blank Metal Photo Insert Keyring - 25mm - Pack of 10Our MH 25 keyring takes an insert size of 25mm. Comes with an acrylic window insert to cover your images on both sides. As part of our keyringfab system this keyring can be assembled by simply using our C25 press machine. The matching cutter matrix used with the machine allows you to cut to the perfect size. The matching assembly tool enables you to press the clear acrylic window into the keyring smoothly. It is recommended to use the press machine