#B20 LATHE Brush with PLASTIC Hub, 2-1/2" diameter, 1/Pk. 2 Rows Converging Bristles. These BRUSHES are wrapped around a core of grit-free, soft Scotch Brite. When searching for KEYSTONE Dental products, if you are not able to find the KEYSTONE Dental product you are looking for. Let us know, we will contact KEYSTONE Dental products and bring what you are looking for.