Tiger Ceramic, 58322, Depressed Center Combo Wheel, Combination Long Life Performance Line Superior Life and Cut, 7 in Wheel Diameter, 1/8 in Wheel, Quick-Change Connector, 30 Grit, Medium Grade, Ceramic Alumina Abrasive, Wheel Type Number: Type 27, 8500 rpm Maximum, Resin Bond, Applicable Materials: Tool Steel, Inconel, High Nickel Alloy, Titanium, Armored Steel, Stainless Steel and Hard-to-Cut Metals, 5/8-11 Center Hole Thread, Reinforced: Yes, Specifications Met: ANSI B7.1-2010