SAIT Stainless Steel Cutting Wheel - 4 1/2" X .045" Type 27 Depressed Center Wheel Saitech Ultimate PerformanceTM 4 1/2" diameter X .045" widthHigh performance, ceramic aluminum oxide grainVery uniform, high density grain structure is extremely durable and self sharpening for long life and cooler cutSo unique it has a patentThin .045 widthFast cutting with long lifeStainless steel, high tensile alloysFerrous metals (iron, steel, welds, etc.)Max RPM; 13,300