You might think that a Grunge Brush is for dusting your Nirvana albums, but this is different (sorry, we couldn't resist). For quickly and easily cleaning nasty, greasy drive chains and sprockets this kit is perfect. Adjustable brush blocks set brush opening for any chain size you like. O-ring safe bristles extend chain life. Includes 4-ounce bottle of EcoTech2 degreaser. Made in USA.