20 Inch disc 46 grit abrasive scrub brush. Alternate brush option that fits the Tennant 7300 (20"), 8200/8210/8300 (20"), T17 (20"). This is the most abrasive brush available for the Tennant 7300, Tennant 8200/8210/8300 and Tennant T17. Compare to Tennant 378951 (Super Abrasive 46 Grit)

 Fits Aftermarket Tennant 378951 46 Grit (772231A)