Premium Quality MaterialThis headset rail support adopts high quality PC + stainless steel material and excellent manufacturing process, which is durable in use. Rotate FreelyWith the hanging after the Comtac intercom headset, headset will be separated out from the arc-shaped headband, used on the card directly to the hanging chain. Hang buckle can be fixed to the helmet on the 2 sides of the helmet rails, after installation, the Comtac headphones headset can rotate freely. Easy InstallationThe adapters work perfectly for Comtac style head phones. They do require some assembly, mainly removing the ear muffs from the head band and then snapping them to the adapters. Well connecting headset to helmet. You are worth it! How to AssembleTake out the headset cloth cover from the 2 sides of the Comtac headset. Take out the headset line from the headband (need hoop wrapped). Hang the headset adapter on both side of the headset. Assemble to the helmet. Bind the headset line to top of the helmet, then use tape to fixed on top. CompatibilityCan match with full range of FAST helmets, ACH helmet, MICH helmet as long as they have arc rails on side. By testing, Comtac I and Comtac II headset can be combined perfectly with this headset adapter. Description: The adapters work perfectly for Comtac style head phones. They do require some assembly, mainly removing the ear muffs from the head band and then snapping them to the adapters. Well connecting headset to helmet. You are worth it! Features: 1. Can match with full range of FAST helmets, ACH helmet, MICH helmet as long as they have arc rails on side. 2. By testing,Comtac I and Comtac II headset can be combined perfectly with this headset adapter. 3. With the hanging after the Comtac intercom headset, headset will be separated out from the arc-shaped headband, used on the card directly to the hanging chain. 4. Hang buckle can be fixed to the helmet on the 2 sides of the helmet rails, after installation, the Comtac headphones headset can rotate freely. 5. Require some assembly, mainly removing the ear muffs from the head band and then snapping them to the adapters. Specification: Material: PC + Stainless Steel Color: Black, Tan (Optional) Suitable: For Comtac I, Comtac II Headset Connected to All Series FAST, ACH Series, MICH Series Helmet Package Weight: approx. 65g Quantity: 2pcs How to Assemble: Take out the headset cloth cover from the 2 sides of the Comtac headset. Take out the headset line from the headband (need hoop wrapped). Hang the headset adapter on both side of the headset. Assemble to the helmet. Bind the headset line to top of the helmet, then use tape to fixed on top. Package Includes: 2 x Helmet Rail Adapters (Not including helmets)