[Material] The barbell spinlock collars are made of high-quality iron material with chrome plating, offering durability and corrosion resistance for long-term use. [Size] The anti-slip collar is designed for 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 fit on 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 choice for fitness enthusiasts. Product Description Specification: Material: Iron with chrome-plated finish Size: 25 mm (1 inch) Color: Silver Package Includes: 4 x Dumbbell Spinlock Collars Note: Measurement may vary by 0–2 mm due to manual measurement. Color may slightly differ from images due to lighting and display variations. We are committed to providing excellent service. If you have any issues, please directly.