Body-Solid BSTLJHX Lock Jaw Hex Collars, Grey (Pair)The BSTLJHX features a quick locking latch and premium gripping surface to ensure safety and security from falls and drops. Slim, light and durable, BSTLJHX are designed for use with all 50mm (2) weight lifting bars. Body Solid Tools Lock Jaw Hex Collars are ideal for home and commercial facilities, group and functional fitness classes as well as high schools and universities. Bulletpoints: Secure weight plates in place Protect bar finish Quick