Strike industries strike rail is a lightweight feature packed rail that you can depend on when entering harm's way.The rail features 1.57" internal diameter for suppressor compatibility ambidextrous qd socket placement a built-in anti-rotation and reinforced steel mounting nut and bolt.The package includes a strike rail handguard mounting hardware allen key barrel nut and wrench and shim kit.Rails: M-LOKType: HandguardFirearm Type: RifleFirearm Model: AR-15Material: AluminumFinish: RedFeatures: M-LOK