DescriptionThe spin-lock collars are made of high-quality cast iron material, which is durable, practical and long time service. The spin-lock collar clamp offers a superior grip to securely hold plates in place, allowing for a safer workout.Features- Color: Silver. - Material: Cast iron. - Size: 5.00X5.00X1.50cm/1.97X1.97X0.59 inch. - These dumbbell hex nuts are easy to carry, suitable for taking them to the gym or for fitness at home. - The collar nuts can be applied to barbells, dumbbells, weightlifting, etc. - Perfect for workouts,standard lifts,overhead press, bench press, or any other workout. - Designed for secures the position of dumbbell on the bar, convenient to install and remove. - Professional and practical design with beautiful appearance, easy to rotate and less wear.