Feature 1Connect Device: With this helmet side rail, you can attach lights, lasers, cameras or other devices to helmet by using standard arc rail dovetail adapter (not included). 2Helmet Accessory: The helmet rail is a great accessory for your helmet, which can be firmly fixed to your helmet and is not easy to fall off. 3Suitable for FAST helmet: Helmet side rail adapts for FAST helmet, use matching screws for easy installation and easy use on the for FAST helmet. 4ABS Material: The helmet rail bracket is made of ABS material, which is sturdy and durable, and has a long service life. 5Used For: This rail mount helmet kit is used for outdoor CS protective equipment helmet. Including screws and spacer, it is easy to install onto helmet.Item Type:HelmetSide RailProduct Material: ABSWeight: Approx. 153g / 5.4oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List2 x Helmet Rail4 x Screw4 x Spacer