Different sizes: Available in three sizes to fit weight discs with diameters of 25 mm, 28 mm, and 30 mm. Refer to the product images and details for accurate measurement and size selection. If uncertain about the correct size, contact the seller for assistance. High-quality materials: Made from durable spring steel and high-grade plastic. The clips are sturdy, firm, and built to last. Plastic handles are smooth, safe, and easy to grip, ensuring secure fastening during workouts. Designed for quick and easy installation and removal. Exercise safely: Dumbbell collars securely hold weight plates in place, ideal for weightlifting, strength training, and fitness exercises. Suitable for use with dumbbells, barbells, squat machines, and other gym equipment. Essential for athletes, bodybuilders, and fitness enthusiasts. Easy to use: Features a strong spring mechanism and ergonomic plastic handle for comfortable handling. Simply attach the clamp to the barbell or dumbbell and secure it tightly. Wide range of applications: Compatible with both smooth and textured barbells. Ensures quick and safe weight adjustments during gym workouts, weight training, and bodybuilding sessions. Material: Plastic and stainless steel 2.5 cm model: Inner diameter 2.5 cm, length 8 cm, fits rods between 2.5–2.6 cm 2.8 cm model: Inner diameter 2.8 cm, length 8.5 cm, fits rods between 2.8–2.9 cm 3.0 cm model: Inner diameter 3.0 cm, length 8.5 cm, fits rods between 2.9–3.0 cm