SUITABLE FOR MOST HELMETSBy testing, Comtac I and Comtac II headset can be combined perfectly with this headset adapter. And it can match with a full range of FAST helmets, ACH helmet, MICH helmet as long as they have arc rails on the side. COMFORTABLE TO USEDrastically improves the comfort and protection of your helmet, you no longer have to fight for space inside your helmet or remove helmet pads to fit a headset. SPECIAL DESIGNHelmet Rail Adapter with the hanging after the Comtac intercom headset, the headset will be separated out from the arc-shaped headband, used on the card directly to the hanging chain. ROTATE FREELYHang buckle can be fixed to the helmet on the 2 sides of the helmet rails, after installation, the Comtac headphones headset can rotate freely. Quantity: 2 pieces Product color: black Product size: 12cm