Loading and Unloading weight plates is quick and easy with Cortex Olympic Lock Jaw Collars. Our Olympic Lock Jaw Collars keep your weights secure throughout the set, and then unfasten easily when you need them to. These collars come with improved clamping power and are built to last, made with high quality ABS plastic and quality design. With Elastomer pads on the interior of the collar, your bars, weights, and collars are protected from damage. Compatible with any Olympic bar, dumbbell, or 50mm sleeve.