Mr. Gasket 1211 Engine Cleaning Brush kit Convenient loop on the end of each brush makes for easy hanging and storage Made from pure stiff bristle nylon Includes 5/16", 1/2", 5/8" diameter brushes with 9" overall lengths Each handle is made from heavy gauge twisted steel wire Size of the three brushes is 5/16,  5/8 and the overall length is 9