Fastens to all Olympic Bars (Sold as a Pair)10 times stronger grip than spring collars (ABS Locking). Easy to use, one hand install, Spring powered Snap-Latch design to keep you safe. Made of hardened nylon resin frames and injection-molded pressure pads. Perfect for cast plate, cast grip plate and rubber grip plate and must for all standard home gyms and professional gym owners - Perfect for CROSSFIT, strong lifts, powerlifting, weight lifting, or any other Olympic bar workout.