Cuts cleaning time to a few minutes! Most all brushes can be driven by a cordless or electric drill. For 12 or 20 gauge Beretta 391 shotguns only. Kit consists of: S/S gas cylinder brush, S/S exhaust valve brush, S/S special designed end brush to clean the bottom of the gas cylinder, S/S special designed speed wrench to remove the counter nut and valve spring assembly, S/S piston brush, brass speed adapter for bore brush, S/S bore and choke tube brush, S/S port brush, nylon double end utility brush and bronze double end utility brush. All this included in a clear plastic carrying case.