TAC-SKY ARC Rail FOR SORDIN MARK + SARA Kit-BK 

Headset helmet bracket contains tools，You need to modify it yourself to assemble

 not include  helmet

ARC OPS-CORE HELMET RAIL  USED
Rail Adapter :can be used on full range of FAST helmets, ACH helmets, MICH helmets,etc who have ARC rails on side.

Features:

The bracket can be rotated 360 degrees and is used to mount the headphone adapter on the helmet. The operation is simple and easy to use.