Material: The hex nut lock ring is made of durable plastic material, which is non-toxic, smooth, sturdy, and durable, and can be reused for long-term use. 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 hold the plate weight safely and firmly during lifting. Safe and reliable, it provides balance and stability. Size: The inner hole diameter of the dumbbell hex nut is 2.5 cm and the outer diameter is 6 cm, designed to fit standard 1-inch dumbbell bars. Package: You will receive 8 black dumbbell hex nuts, sufficient for daily use and extra needs. Applications: The barbell hex nut fits all standard 1-inch dumbbell or barbell bars. These rotating locking ring clamps are suitable for dumbbells, barbells, and weight lifting exercises. They are portable and ideal for gym or home workouts. Specifications: Material: Plastic Color: Black Package Contents: 8 x Dumbbell Hex Nuts Features: 1) The dumbbell end cap is made of strong and durable material for long-lasting use. 2) Smoothly contoured design allows for quick and easy installation and removal of weight plates. 3) A practical accessory for fitness enthusiasts, ideal for personal use or as a gift.