Preferred Material: Collar clips are made of high quality ABS material, high hardness, high strength and durability; The surface is finely crafted and will not hurt your hands. Protect your barbell. These collar clips are popular in many gyms. Quick Release - Weightlifting clamps are equipped with barbell ring clamps with quick release and locking, easy to open and close with one finger, easy to install in a flash and do not slip during use. Safety Protection: Barbell clamps are safer than most traditional spring clamps. The barbell clamps ensure that the barbell is firmly in place, so you don't have to worry during training. The included rubber rings increase the friction between the clamp and the barbell, and several integrated stabilizing screws ensure safety. Wide Use - Barbell rings are suitable for all types of resistance training, suitable for fitness, push-ups, weightlifting and other sports, widely used at home, gym and other outdoor activities, help reduce injuries with barbell plates. What You Get - Included are 2 pieces of barbell clamp rings, enough for daily use and replacement, which effectively keep the weights in place so you can fully enjoy your workout, especially suitable for people in guest rooms or office trains.