Usage Tips:Description: 【Quality Material】: Crafted from strength 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, from any unwanted movement or slippage during exercise for a security and reliable workout experience 【Material Composition】: Made of sturdy steel, providing long time 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 Collar Note: Please allow slightly errors 1-2cm/0.39inch-0.79inch differences due to manual measurement.