Package contents: 4 robust 2.5 cm rotating locks, perfectly fitting standard 2.5 cm barbells and dumbbells. They are robust enough to prevent them from falling off, ensuring extremely comfortable and safe use. Premium material: Each lock is made of high-quality steel and premium black plastic. The ultra-soft protective sleeve makes assembly and disassembly easy and quick, allowing you to easily lock your barbell. How to use: The barbell clamp has an ergonomic design. Press and hold the button to increase the diameter until it reaches the correct position on the barbell, then release the button to lock the barbell. This lever mechanism ensures easy extension and retraction. Dimensions: The 2.5 cm barbell clamp has a diameter of 25 mm and an total length of approximately 13 cm. Compact but powerful, it is ideal for gyms, workouts and even professional athletes' strength training.