Especially useful in preparing contrast finishes and texturing—much coarser than a brushed satin finish. Also used for fast grinding and metal removal, these very hard wheels are made of silicon carbide in a resinoid bond. Heatless Wheels break down quickly, constantly exposing new grit to produce a uniform, coarse, brushed-look finish with tiny highlights. Easily shaped with a file. 1/16″ metal arbor hole.