GrovTec US KeyMod Picatinny Rail 3.8in 9 Slot Black. Includes hardware and allen key for install. Specifications for GrovTec US KeyMod Picatinny Rail: Manufacturer: GrovTec US Color: Black Finish: Type III Hard Coat Anodized Fabric/Material: Aluminum Gun Rail: Picatinny Features of GrovTec US Picatinny Rail with Push Button Base 3.10" Length 5 Slots Keymod Black GTSW231: Allows the attachment of various 1913 Picatinny rail-mounted acessories such as lights vertical grips etc. Features beveled ends to reduce snagging and eliminate sharp corners and edges Solid aluminium construction Package Contents: GrovTec US KeyMod Picatinny Rail GrovTec US GTSW229: KeyMod Picatinny Rail 3.8in 9 Slot Black