The Wilcox L4 Three-Hole Shroud is compatible with helmets drilled in the standard MARSOC/WARCOM 3-hole pattern. Machined interface provides a solid lock-up with any standard bracket NVG mount.  Sleek low-profile polymer frame design doesn't snag on ropes, lines, risers, and straps. The L4 Three Hole is compatible with their retractable lanyard system. The used material is glass-reinforced polymer and aerospace-grade aluminum alloy.