Size: 2.5cm, 3cm Color: blue, red, black Material: plastic Package content: 2*barbell bar buckle 1. Robust materials: With a hole diameter of 25 mm / 30 mm, made of high-quality ABS plastic that can withstand heavy weights and intensive training sessions. 2. Advanced Design: Spring-powered snap-latch design keeps you safe, faster to use than classic spring locks, providing more safety during training by securely fixing the weight plates. 3. Durability: Thanks to the rubber strips on the inside, the locks are secure and prevent the plates from loosening or slipping. 4. Easy to close: Easy to open and close—just close it and it's tight. 5. Fits: Barbell clamps for weightlifting, powerlifting, gym, fitness, crossfit, weight training, strength training, triceps trainer, and more.