Vitrified Mounted Point, Abrasive Material Ceramic, Bond Type Vitrified, Overall Dia. 5/8 in, Overall Thickness Not Applicable, Shank Dia. 1/4 in, Grit 80, Shape A26, Shank Length 1 1/2 in, Specification 3NQ80, Operating Speed - Maximum 61,120 RPM, Series Quantum, Grade Medium, Compatible Tool Type Die Grinder, Straight Grinder