20" Machine Grit Stripping Brush w/Plate 18GX92Grit brushes reduce eliminate the need for black stripping pads. No more re centering wobbly pads, or flipping them when they're filthy and wet. These are also great scrub brushes, and also work at getting those grout lines back to new. Just attach your grit brush to your machine, and strip away floor finish dirt easily. Constructed with . 050 nylon bristle with # 80 grit silicon carbide particles embedded into each bristle, long life span and great