The Lock-Jaw Pro Barbell Collar is specially designed for Bumper Plate use, Olympic Lifting, and Crossfit workouts. Like the original Lock-Jaw, The Lock-Jaw Pro barbell collar features a solid-core nylon resin frame and Lock Lock solid injection molded pressure pads, making it nearly unbreakable! One hand installation and removal is easy with the large locking lever. A permanent spring snap-latch keeps the collar secured on the bar through the most brutal workouts. The latch is easily released with one hand when changing weights. Innovative design, superior durability, and exceptional performance make the Lock-Jaw Pro Barbell Collar an excellent choice for Crossfit and all Bumper Plate workouts!