Material: The barbell spinlock collars are made of high-quality iron material, chrome plated, durable and corrosion resistant 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: Ideal for use with bumper plates and lifting platforms. A practical gift for fitness enthusiasts. Specifications: Material: Iron with chrome plating Size: 1 inch (25 mm) Color: Silver Package Includes: 4 x Dumbbell Spinlock Collars Note: Due to manual measurement, there may be a 0–2 mm error. Colors shown in images may vary slightly due to lighting and display differences. We are committed to providing excellent service. If you have any issues, please .