Characteristics: 1. Can fit full range of FAST helmets, ACH helmets, MICH helmets as long as they have side arc rails. 2. By testing, Comtac I and Comtac II headset can be perfectly paired with this headset adapter. 3. When hanging behind the Comtac intercom headset, the headset will separate from the arc-shaped headband used on the card directly to the hanging chain. 4. The hanging buckle can be attached to the helmet on the 2 sides of the helmet rails, after installation, the Comtac headset can rotate freely. 5. Requires some assembly, mainly removing the ear cups from the headband and then snapping them onto the adapters. Specification: Material: POM stainless steel Color: Black, Light Brown (Optional) Suitable: for Comtac I headset, Comtac II connected to all FAST series, ACH series, MICH series helmet Package weight: approx. 65g Quantity: 2 pcs Package includes: 2 x helmet rail adapters (not including helmets) How to assemble: Remove the cloth cover of the headset on the two sides of the Comtac. Remove the headset cord from the headband (need to wrap the hoop). Hang the headset adapter on both sides of the headset. Attach to the helmet. Tie the headset cable to the top of the helmet, then tape it to the top. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.