Description: 【Quality material】: This dumbbell bar nut is made from quality cast iron and steel, offering durability, resistance to wear and tear, and long lasting use without deformation 【Dumbbell fixing nut】: Designed specifically for securing dumbbells, this dumbbell screw clamp is easy to install and provides stability for your strength training 【Suitable size】: With an inner diameter of 2.6 cm, this weight bar screw clamp is compact, portable, and fits barbells or dumbbell bar with a diameter of 2.5 cm 【Wide application】: This barbell spinlock collar is ideal for strength training; weight lifting; adjustable dumbbell handle; straight barbell uses among others 【Practical accessory】: This strength training equipment makes a practical gift for family members or friends who enjoy weightlifting, fitness training or home workouts Specification: Material: Cast Iron and Steel Size Chart: Hole Diameter 2.6cm/1.02inch Package Includes: 1 Dumbbell Bar Nut(4 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.