With Tiger® Ceramic 9 in type 27 depressed center Grinding Wheel, there's no more compromise when grinding the toughest metal. Now you can maximize your time on the job with a superior combination of life and cut rate for maximum productivity. self-sharpening and cool cutting, ceramic grain remove material effortlessly while a hard bond keep working longer. The flat profile of the wheel in combination with depressed center allows for a wide range of grinding angle (0 to 45). Ceramic grain utilize a crystalline structure that is designed with million of fracture point that self sharpen at a higher rate than other grain. The result is a higher material removal rate, faster cutting speed, cooler grinding and reduced friction at less pressure which reduces operator fatigue. For those that put a premium value on getting work done faster and optimizing Grinding Wheel usage on a right angle grinder, Tiger® Ceramic deliver. Tiger® Zirc Grinding Wheel, Fast Cut Long Life High Performance, 9 in Wheel Diameter, 1/4 in Wheel, 7/8 in Center Hole, Arbor Connector, 24 Grit, Z24T Grade, Wheel Type Number: Type 27, 6650 RPM Maximum, Resin Bond, Applicable Materials: Armored Steel/Cast Iron/Cast Steel/Ductile Iron/High Nickel Alloy/Inconel/Stainless Steel/Steel/Titanium/Tool Steel, Wheel Hardness: T, Black Wheel, Reinforced: Yes, Specifications Met: ANSI B7.1