Rex-Cut kit includes Sigma Green wheel with zirconia-ceramic grain and proprietary bonding to aggressively grind-out cracks and remove welds. It has Cotton Fiber Type 27 blending and finishing wheel, which leaves 32 rms or better finish on stainless steel, and also works on aluminum. Packaged in clamshell, two 4½ in. dia wheels are offered with or without hubs.