The Park Tool CM-25 Professional Chain Scrubber is a shop quality cleaner built to give years of constant use.Proven chain scrubbing technology leaves chains sparkling cleanDurable A380 aluminum die cast case and removable handleDual sided sponges and wicking pads to help reduce dripsRotating brushes clean on all four sides of every linkBrush and sponge cartridge quickly and easily clicks in and outLocking cover with stainless steel hinge pinsWorks with all multi-speed bikes (5 6 7 8 9 10 11 and 12-speed) and some single-speed models100% serviceable