The XP™ ultra performance ceramic fast grind wheels provides fast cutting speeds at 14% increased grinding speed vs existing XP™ ceramic grinding wheels, the wheels can be used on most materials and stainless steel when heavy grinding is required, they are manufactured in our facility that is certified to the latest ISO 9001:2015 standards. DeWALT® XP™ Abrasive Grinding Wheel, Fast, 4-1/2 in Wheel Diameter, 1/4 in Wheel, 5/8-11 in Center Hole, Arbor Connector, 24 Grit, Coarse/Extra Coarse Grade, Ceramic Abrasive, Wheel Type Number: Type 27, 13300 RPM Maximum, Resinoid Bond, Wheel Hardness: R, Black Wheel