Suitable for Howard Leight Impact Sports Earmuffs.The rail adapter is designed to rot Suitable for Howard Leight Impact Sports Earmuffs. The rail adapter is designed to rotate 360 and so you can easily get your headphones out the way if you need to. Will not cause any hindranceate 360 and so you can easily get your headphones out the way if you need to. Will not cause any hindrance. The hole on the top of the claw is a square hole, and the telescopic column has a groove.Then insert it into the square hole, and rotate 90 to fasten.The hole on the top of the claw is a square hole, and the telescopic column has a groove. Then insert it into the square hole,and rotate 90to fasten. Rail Adapter can be used on full range of FAST helmets,ACH helmets,MICH helmets,etc who have ARC rails on side. Only 0.3mm thickness TPU as cover materials for gel protection cups, so that increases the time of wearing ear defender for you without discomfort. Greatly provide comfort and reduce noise . Compatible with Howard Leight by Honeywell Impact Sport Shooting Earmuffs, compatible Pro, Sync, etc. Pop-out the old earpads by your fingers, and snap the new gel into headsets. Easy to replace. Note: The product does not include headphones Packing: 1 pair of rail adapter 1 pair of gel ear pads