Tiger INOX Depressed Center Wheel, Contaminant-Free Performance Line, 4-1/2 in Wheel Dia, 1/4 in Wheel Thickness, 7/8 in Center Hole, Arbor Connector, 24 Grit, Coarse Grade, White Aluminum Oxide Abrasive, Wheel Type Number: Type 27, 13300 rpm Maximum, Resin Bond, Applicable Materials: Stainless Steel and Harder Steel Grades, Wheel Hardness: R, Yes Reinforced, ANSI B7.1-2010 Specifications Met.Weiler’s high quality line of grinding wheels help metal fabrication professionals get the most demanding jobs done right and done fast.