[Material] The barbell spinlock collars are made of high-quality iron material with a chrome-plated finish, offering durability and corrosion resistance for long-term use. [Size] The anti-slip collar is designed to fit 25mm standard barbells or dumbbells. Please verify the size compatibility before purchasing. [Anti-Slip Design] The barbell clamp features a non-slip rubber ring to ensure a secure and stable attachment to the barbell or dumbbell bar. [Package Content] 4 pcs x Dumbbell Spinlock Collars [Application] Ideal for use with bumper plates and lifting platforms. A practical choice 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 variation. Colors shown may differ slightly due to lighting and display settings. Guarantee: We are committed to providing excellent service. If you have any issues, please directly.