Malish 18″ clean grit general purpose scrubbing w/univ clutch plate, blue – 816518np 18″ clean grit for 20″ floor machine. grit brushes offer scrubbing solutions to a wide range of cleaning situations. Silicon carbide impregnated nylon bristles are self replenishing as brush wears. Outlasts floor pads over 100 to 1. Time and cost savings. Water and chemical resistant tuff-block for maximum life expectancy. Must be run wet. Trim length 1 1/2″.