12.5" Carbon Fiber Free Float Tube Weight: 0.45 Pounds Inside Diameter 1.7" 6 MLOK Slots on 7 sides, 3 MLOK Slots on the top. WILL NOT fit behind Rifle Gas system length front sight. For use with low profile gas blocks only. Includes: Aluminum Barrel Nut Barrel Nut Wrench for use with 1/2" Socket Drive Torque Wrench (Torque Wrench Not Included) Screws/Mounting Hardware To Install This rail you will need the following tools that are NOT included: Action Blocks for AR15 Upper Torx T15 Wrench 9/64" Allen Wrench 1/2" Socket Driver torque wrench for use with supplied barrel nut wrench Me Mfg: Ke Arms