HOS-D025 These pairs of aluminum lock jaw collars are essential items for fitness enthusiasts. They can firmly hold the weight plates on the barbell, ensuring that the weight plates will not move during intense training. The collars are lightweight yet sturdy, easy to operate, and highly durable, making them suitable for daily use in various gym environments. Their stylish design is not only aesthetically pleasing but also prevents scratches on the barbell and offers a comfortable grip, making them an ideal choice for weight - lifters at all levels.