Keys can be attached and removed from these key rings in no time. In combination with a connection ring, chain or snap hook, they are also brilliant to create unique key rings. The larger rings are also very useful for combining colour sample cards, fabric samples or flash cards. These silver-coloured metal key rings with a handy snap closure are available with an inner/outer diameter of 17mm-20mm, 20mm-22mm, 25mm-30mm, 30mm-34mm, 32mm-37mm, 35mm-40mm, 40mm-44mm and 50mm-55mm.