There are 3 different sizes. They fit diameter of 25mm, 28mm, 30mm barbell bars, Please confirm your equipment size before purchasing. These spring clips are made of premium ABS and steel, sturdy and durable, refined and workmanship, the rubber grips allow easy and comfortable removal. The spring loaded latch provides superior grip to securely hold the plates in place, allowing for a safer workout. Add clips to dumbbells or free weights and safely perform snatches, squats, deadlifts of earth and various presses. The compact structure of this equipment makes it an ideal companion to accompany the rest of your home gym equipment. It allows quick changes of weight plates and can be used for different plates including plates steel, urethane or rubber. The package comes with 6 pieces of dumbbell springs, enough quantity can meet your training needs, and also can be applied to share with your friends. Your health and comfort are our passion! feel free to contact us if you have any questions. product description Features: Made from solid steel and a rubber support handle, the rubber grips allow easy and easy removal. Used to secure the weight plates for added safety when lifting weights. The barbell clamp is portable, durable and lightweight, which makes it easy to get back into shape. Prevents plate weights from sliding off the bar. Improve your balance, your coordination, your flexibility. Suitable for use on home, multiplayer and commercial gymnastics equipment. Specifications: Material: spring steel, ABS plastic Color: silver, black The corresponding size: - Diameter: 25 mm - Diameter: 28 mm - Diameter: 30 mm Package included: 2x 25 mm spring clamp clips 2x 28mm spring clamp clips 2x 30 mm spring clamp clips Special declarations: 1-2cm difference exists due to the different measurement way, please confirm the detailed size before ordering, thanks for your understanding & amp; cooperation. If there is anything unexpected, please contact us. We can help you within 24 hours.