Grinding Cone, Grinding Cone Type 16, Grinding Cone Diameter 2 3/4 in, Grinding Cone Length 2 1/2 in, Arbor Hole Size 5/8 In.-11, Abrasive Material Zirconia Alumina, Abrasive Grit 16, Max. RPM 13,195 RPM, Specification AZ16-R