The NCSTAR AR15/M4 Gunsmithing Tool Kit provides a comprehensive collection of specialized tools for rifle assembly and maintenance organized on a large 36" x 29" black cleaning mat that rolls up for compact storage.NCSTAR AR15/M4 Gunsmithing Tool Roll KitLarge 36" x 29" cleaning mat with roll-up designM4 Armorers wrench for barrel nut castle nut muzzle brake and buffer tubeAR15/M4 handguard removal toolA1 & A2 front sight adjustment toolBrass and nylon hammer setSteel punch set: 5/64" 3/32" 1/8" for various roll pins1/4" brass punch includedPerfect for gunsmithing professionals and enthusiasts who need AR15/M4 specific tools for building from stripped lower receivers installing aftermarket accessories and performing maintenance work with organized portable storage.