1Equipped with perfect multi slot guide rail, rail is designed for all compatible standard protective gears, there are four different lengths for you to choose. 2It is suitable for connecting a variety of accessories, such as flashlights, iron sights, red and green dot sights, micro points, hangers, sights, optics, grips, bipods, or other accessories. 3It is made of high quality T66061 aviation aluminum alloy and high strength steel material, black matte anode oxidation facing to provide persistent and safety performance. 4You can use hex wrench tool to install these screws. What's more, it is easy to install and disassemble. 5With Lightweight and solid style, ultra light and firm aluminum construction, and simply design, which can effectively reduce its volume without adding too much weight and volume when hunting. Item Type:PolymerRailAccessorySet Weight: Approx.95g / 3.4oz Material: Glass Fiber Nylon Color: Sand 4 x Guide Rails 8 x Screw 8 x Nut 1 x Wrench