[Material]: The barbell spinlock collars are made of high-quality iron material, chrome-plated, durable and corrosion-resistant, designed for long-term use. [Size]: The anti-slip collar is suitable for 25mm standard barbells or dumbbells. Please check the size before purchasing. [ANTI-SLIP DESIGN]: The barbell clamp is equipped with a non-slip rubber ring, ensuring secure attachment to the barbell or dumbbell bar. [Package Content]: 4 pcs x Dumbbell Spinlock Collars [Application]: Perfect for use with bumper plates and lifting platforms. Also a practical gift for fitness enthusiasts. Specification: Material: Iron with chrome-plated finish Size: 1 inch / 25 mm Color: Silver Package includes: 4 x Dumbbell Spinlock Collars Note: Due to manual measurement, there may be a 02 mm error. The color shown in the picture may not fully match the actual item due to differences in recording methods and display devices. Please confirm you accept these conditions before purchasing. We are committed to providing the best service. If you encounter any issues during use, please .