Monstrum Tactical Mid Length (13 Slot/5.25") Picatinny Rail for Keymod Systems (Black) Mid Length Picatinny rail, 13 slots or 5.25 inches long, for use with standard Keymod rail systems Picatinny 1913 rail accepts standard Picatinny accessories Rail installs quickly to any universal Keymod platform, allowing for fast modular attachment of grips, bipods, sights, or other accessories Crafted from lighweight aerospace grade aluminum Package includes all necessary screws and locking nuts, as well as a hex wrench. No additional tooling necessary for installation