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 12 cm (0.390.79 inch) due to manual measurement