【Quality Material】: Crafted from strong steel, these dumbbell collars are designed for durability and stability, ensuring that your weights remain securely in place during workouts 【Secure Design】: Featuring a screw tightening mechanism, these barbell collar clamps firmly lock weight plates in position, preventing any unwanted movement or slippage during exercise for a secure and reliable workout experience 【Material Composition】: Made of sturdy steel, providing long-term performance and resistance to wear and tear 【Product Dimensions】: Each collar has an approximate diameter of 2.5 cm (0.98 inch), making them suitable for barbells 【Package Contents】: Includes two barbell collars per package, offering a complete set to secure both ends of your barbell effectively Specification: Material: Steel Size Chart: Diameter: 2.5 cm (0.98 inch) Package Includes: 2 Barbell Screw Collars Note: Please allow slight measurement errors of 1–2 cm (0.39–0.79 inch) due to manual measurement