High performance premium grain Extremely fast and aggressive stock removal Grinds smooth and quiet, minimal chatter Long life with high productivity Minimizes operator fatigue Cool grinding Won’t discolor or warp stainless Our most aggressive grinding wheel is now available. Sigma Z, which blends rapid stock removal and operator control is engineered for improved productivity. Sigma Z removes an average of 24.06 grams of 304 Stainless Steel weld per minute, up to 15% more than other leading wheels. This new wheel is also precision-balanced for a noticeably smooth and quiet operation, providing exceptional metal removal rate along with chatter-free grinding.