The Lock-Jaw Pro collar is specially designed for Bumper Plate use, Olympic lifting, and OCR training-style workouts. Like the original Lock-Jaw, The Lock-Jaw Pro barbell collar features a solid nylon resin frame and injection molded pressure pads, making it nearly unbreakable. The single-action cam lock securely clamps the collar once positioned on the bar. 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. The Lock-Jaw Pro Barbell Collar is an ideal choice for all bumper plate workouts or Olympic-style lifting. An easy to use permanent snap-latch keeps the collar secure throughout your most brutal workouts. 10x stronger retention force than traditional spring collars, the Lock-Jaw Pro will help prolong the life of your bumper plates. Fits 2" Olympic bars. Sold in pairs