Grinding Wheel, Type 29 Abrasive Wheel Type, 4 1/2 in Abrasive Wheel Diameter, Arbor Hole Size 5/8 In.-11, Thickness 1/4 in, Abrasive Material Diamond, Abrasive Grit 24, Max. RPM 13,600 RPM, Specification Type 29, Bond Type Brazed Single Layer