describe: Compatible only with Howard Leight Impact Sport Earmuffs Since the rail adapter rotates 360 degrees, you can easily move the headset out of the way if necessary. Doesn't get in the way of anything. There are grooves on the telescopic column and the opening at the top of the claw is square. Then, insert it into the square hole and rotate it 90 degrees to secure it. The key to fastening the plastic ring is the groove of the wire. Unlike the original earmuff design, it is recommended to use them as a set. It is not recommended to use with original earmuff accessories as it may cause incompatibility issues. Easy to install, saves space and provides a more comfortable wearing feeling Package contents: 1 piece headphone stand