This Right Cut Angle Grinder Cutting Wheel is an ideal choice for a variety of steel materials, including 400 series stainless, hard carbon and soft carbon steels Sized as a 4 1/2 cut off wheel with a durable bond, this cutting wheel is designed to cut at high rates, ensuring it's longer product life This cutting disc design features an advanced ultra-thin depressed center for cut-off only applications where minimum material loss is desired This cutoff wheel is developed from versatile aluminum oxide that preserves longevity and works well with a variety of machines, horsepower and operations up to 13580 RPM Wheel Type is 27/42 with a 4 1/2 inch diameter and .045 inches thickness. Dimensions: 4-1/2 x .045 x 7/8 In. Comes as a pack of 25 cutting wheels