Material: The hex nut lock ring is made of durable plastic material, which is non-toxic and flexible, sturdy and durable, and can be reused and used for a long time. Easy to use: The dumbbell hex nut is easy to use. Just twist it and clip it onto the dumbbell. The collar with hex nut makes moving the plate quick and easy. It can also hold the plate Weight safe and fast when lifting. Safe and reliable can provide balance and stability. Size: The inner hole diameter of the hexagon nut of the dumbbells is 2.5cm and the outer diameter of the hexagon nut is 6cm, which is a special size for environmental protection dumbbells. 2.5cm) dumbbells for weightlifting Twist cuffs in standard or dumbbell style. Package: You will get 8 pcs black dumbbell sex nuts, enough use to meet your daily and spare needs. Usage : The barbell hex nut fits any standard 1 inch barbell or barbell bar. Our rotating lock ring clamps are suitable for dumbbells, dumbbells, powerlifting, etc. They are easy to carry and suitable for going to the gym or working out at home. Specifications: < p>Material: plastic Contents in the package with black color: 8 * Dumbbell hex nuts Function: 1) The end of the dumbbell screw is made of strong and durable material for long-term use. 2) Smoothly contoured fingertip grips make it easy and simple to install and remove barbells or dumbbells . 3) You can give away the walnut dumbbells to your family and friends, especially fitness .