Perform lightning-speed weight plate changes with the most intelligently designed weight collar available! Simply slide the Muscle Clamp on to your bar and lock it into place with a single motion. Once in position, the high pressure locking system will hold your weights safely and securely in place. Constructed of durable nylon, Muscle Clamps are easy to handle. A special inner lining prevents bars from getting scratched and also gives extra gripping power. Fits all Olympic bars. Muscle Clamps are sold as pairs.