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.Packing list: 4 x nuts