Successor to the famous Park Tool Cm-5.2 chain cleaning device. Compatible with central motor and coaster hubs. Cleans the bike chain quickly, easily, and effectively. Uses a large solvent reservoir, rotating bristles, and a two-step cleaning process. Works with all derailleur chains (5, 6, 7, 8, 9, 10, 11, and 12 speeds), as well as some entry-level models and electric bikes. A strong magnet at the bottom of the liquid reservoir traps metal particles. A special sponge minimizes drips and dirt. Sturdy handle for easy use and control.