[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 features a non-slip rubber ring to ensure 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. Specification: Material: Iron with chrome-plated finish Size: 1 inch / 25 mm Color: Silver 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 settings. We are committed to providing excellent service. If you encounter any issues, please directly.