loamauto Pair of Quick Release ABS Locking Olympic Standard Size Barbell Clamps Collars Made of hardened reinforced plastic ,ABS Fits for all 2-inch Diameter Olympic bars It's very easy to use,spring powered Snap-Latch design to keep you safe. Perfect for crossfit workouts,Olympic lifts,overhead press,deadlifts,bench press,or any other workout using 2-inch Olympic Barbell. Fast locking and release,not easy to slide.