Description 1. Made of ABS material, shock-proof, corrosion-resistant and environmentally friendly 2. No need to make any changes to the helmet, the guide rail can be installed on the helmet within a few seconds 3.The helmet rail mount suits for ARC guide weaver adapter which is not included, so that you could add the light, camera and so on on your helmet 4.Plus, this rail mount comes with the installation point for optional NVG rubber band and quick release goggles band clip(not included) to bring you the convenience Specification: Size: 18x6.3cm Material: ABS Color: Black, Sand, Green, Grey Weight: 125g Packaged include: 2* helmet guide 1* set of screw bolts and screw nuts Note: All sizes approximate and should allow for manufacturing tolerances. Dear buyer,if the parcel is found to be badly damaged, please take a photo , reject it and contact us for resolution. Due to the influence of the display and the light of the photo, there may be a gap between the color of the goods and the picture you If you are not satisfied with the delivery, please contact our customer service in time