KNUCKL™ is a modular helmet accessory mount for use on helmets equipped with accessory rails such as Ops Core, Team Wendy, Crye and others. It offers tension-adjustable 3-axis articulation and the ability to mount up to two accessories depending on your mission. The mounting interfaces accept most Unity FUSION accessories. It also incorporates a socket to accept the Wilcox Retention Lanyard to retain the gear during a break-away. NOTE: KNUCKL is not compatible with Team Wendy Helmets when used in conjunction with helmet mounted hearing protection.NOTE: Lanyard not included. Dimensions: 1.375″(L) x 2.50″(W) Weight: 0.9 oz. Material: Polymer Mount Type: Ops-Core ARC Rail / Team Wendy EXFIL Rail Compatibility:Surefire Scout Lights (No adapter required)Contour Camera (Adapter included)PrincetonTec MPLS Point/Switch Lights (Adapter included)Rail-Mounted Lights (Adapter included) Kit Includes:KNUCKL MountArc AdapterTeam Wendy AdapterMPLS AdapterContour Camera AdapterRail SectionMounting Hardware