Ring Diameter : 25.4mmModel Number : L4G24Guide Length : OtherOrigin : Mainland ChinaFeatures: Made of high quality aluminum with high oxidation resistance. The surface is color-locked. Strong durable and lightweight. Compatibility: Suitable for PVS15, PVS18, GPNVG18 night vision. Also Suitable For Most Helmets, Such As ACH, PASGT, MICH, M88. Stability: More securely than any other tactical helmet accessory. Allows for one handed release of the NVG. Adjustment: Ergonomically optimized vertical, tilt, and fore/aft-eye-relief adjustment levers for a custom-fit user experience. Application: The night vision helmet mount is suitable for CS games, explosion-proof, cycling, outdoor travel, etc. Specification: High quality aluminum material. Dimensions (Operational) 10cm L x 6.5cm W x 6cm H. Weight (G24 Mount Only) 180g. Vertical Height Adjustment: 2.3cm Total Travel. Fore/Aft Travel: 2.8cm Total Travel. Color: Black,Gold,Silver Package included: One piece Metal L4 G24 NVG Mount with box Notice: Not include the helmet Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store