MULTI-PURPOSE, COMPACT SIZE: Snall: 1.36” X 0.5” with 0.3” opening gates for convenient carrying, Medium: 1.9” X 0.72” with 0.38” opening gates for convenient carrying, Large: 2.4” X 1” with 0.6” opening gates for convenient carrying, DIY and organization of keys, identification tags, pill fob and any small accessories with holes or hooks.