Eleiko Öppen collars secure weights while lifting in a way that saves time and improves performance while ensuring safety. The patent-pending design is a fresh perspective on a piece traditionally constructed as a full circle. The design eliminates the need for sliding collars the full length of the barbell sleeves when weights are loaded or unloaded. Simply place the collar adjacent to the weights and press the lever down to lock it into place. The lever is easily engaged with a finger enabling single-handed operation. Collars stick to the rack with integrated magnets, so they are accessible for quick weight changes during a session.