Description from site:

Anti-Slip: The Green7 2"olympic clamps is different from the common styles on the market. It has a thick solid nylon body and in-set textured non-slip pad to increases the friction and more clamping area of exercise collars,which is not easy to slide and break Quick Release & Secure Latch: One click lock design for easy to locked and unlocked and keep weights in barbell place Material: The green7 weight clips for bars made of advanced solid nylon with high strength and good toughness. Application: It fits for 2 inches Olympic standard size. Perfect for workouts, Olympic lifts, overhead press, deadlifts, bench press, or any other workout using 2 inches Olympic bar.