The adapters are a perfect match for Comtac style headphones. They require some assembly, mainly removing the earpads from the headband, and then snapping them onto the adapters. Connecting headset well with helmet. You are worth it! Characteristics: 1. It can fit the full range of FAST helmets, ACH helmets, MICH helmets as long as they have side arch rails. 2. For testing, the Comtac I and Comtac II headsets can be perfectly combined with this headset adapter. 3. After hanging behind the Comtac intercom headset, the headset will be separated from the arc-shaped headband used on the card directly for the hanging chain. 4. The hanging buckle can be attached to the helmet on 2 sides of the helmet rails, after installation, the Comtac headphone headset can rotate freely. 5. Require some assembly, mainly removing the earpieces from the headband, and then snapping them onto the adapters. Specification: Material: POM stainless steel Color: black Suitable: for Comtac I headset, Comtac II connected to all FAST series, ACH series, MICH series helmet Package weight: approx. 65g Quantity: 2 pcs. How to assemble: Remove the cloth cover of the headset on the two sides of the Comtac. Remove the headset cord from the headband (the hoop must be wrapped). Hang the headset adapter on both sides of the headset. Attach to the helmet. Tie the steering cable to the top of the helmet, and then secure it to the top with the tape. Package includes: 2 x helmet rail adapters (not including helmets) Note: