4" dia 2" thick 5/8" arbor Gemini Flaring Cup Wheel, Norton Abrasives, Mfr#: 66243510512

Flaring Cup Grinding Wheel, Abrasive Material Aluminum Oxide, Back Thickness 3/4 in, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 16, Overall Diameter 4 in, Overall Thickness 2 in, Rim Thickness 3/4 in, Primary Material Applicationn Aluminum, Brass, Bronze, Cast Iron, Copper, Steel, Nickel Alloy, Stainless Steel, Titanium, Tool Steel, Compatible Tool Type Cup Grinder, Specification 57A16-Q, Wheel Hardness Q, Wheel Type Type 11, Maximum Operating Speed 9,070 RPM