Material: The hex nut lock ring is made of durable plastic material, which is non-toxic and smooth, 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 clamp it onto the dumbbell. The collar with hex nut makes moving the plate quick and easy. It can also hold the plateWeight safe and firm when lifting. Safe and reliable can provide balance and stability. Size: The inner hole diameter of the dumbbell hex nut is 2.5cm and the outer diameter of the hex nut is 6cm, which is a special size for environmental protective dumbbells. 2.5 cm) dumbbells for weight liftingStandard or dumbbell style twist cuffs. Package: You will get 8pcs black dumbbell hex nuts, enough to meet your daily use and spare needs. Applications: The barbell hex nut fits all standard 1 inch dumbbell bars or barbell bars. Our rotating locking ring clamps are suitable for dumbbells, dumbbells, weight lifting, etc. They are easy to carryand suitable for going to the gym or exercising at home. Specifications: Material: plastic Contents of the black color pack: 8 * Dumbbell Hex Nuts Function: 1) The end of the dumbbell screw is made of strong and durable material for a long time use. 2) Smoothly contoured fingertip grips allow for quick and easy installation and removal of barbells or dumbbells. 3) You can gift the walnut dumbbells to your family and friends, especially fitness enthusiasts.