BUY THIS PRODUCT IN BULK AND SAVE American made One of the most widely used barbell collars on the market. Single action, secure, fast-locking latch. Solid nylon resin or solid steel frame construction. Fully encased injection-moulded grip pads. Lightweight and unmatched durability. Sold as a pair Lock-Jaw OLY 2 Olympic Suggest for applications where the weights never dropped or touch the floor. Recommended for steel, urethane, or rubber coated plates. Do not use for Olympic lifts. The Original Lock-Jaw, the Olympic model is a favorite among coaches, universities, and gyms around the world due to their fast and simple operation. Lock-Jaw PRO 2 The Lock-Jaw Pro Barbell Collar is suitable for all bumper plate workouts. An easy to use permanent snap-latch keeps the collar secure throughout your most brutal workouts. Ten times stronger retention force than traditional spring collars, the Lock-Jaw Pro will help prolong the life of your bumper plates.