The Wilcox L4 G11 Non-Breakaway Mount with Horn Interface Shoe allows firm attachment of the AN/PVS-7B/D and AN/PVS-14arm to a variety of combat helmets when attached to a WIlcox One-Hole HMI, Three Hole HMI, or the standard Army Shroud. The NVG mounting system prevents breakaway of the mount, thereby reducing risk of loss of the NVG. Specifications Dimensions (operational) 4.65" L x 2.58" W x 3.80" H Weight (G11 Mount Only) .40 lb. (6.35 oz.) Material Construction: Light Weight, Aerospace Grade Metal Accommodates NVG AN/PVS-7B/D, AN-PVS-14 Vertical Height Adjustment: .90" Total Travel Fore/Aft Travel: 1.60" Total Travel Tilt to Horizon: 12 Above, 5 Below Flip: 110Adeg