Description Our Pull Through Grenade Launcher Cleaning Kit cleans all 37mm and 40mm grenade and flare launchers, as well as riot guns. 22 Inch Pull Cord – Easily Shortened by the User Sliding Pull Bead 2 Brush Adapters with 5/16 x 27 Female Threads 1 – 37/40mm Bronze Bore Brush 1 – 37/40mm Bore Mop GB-5 Double Ended Cleaning Brush GC-2 Silicone Treated Cloth