' Flaring Cup Grinding Wheel, Type 11, Face Dia. 6 In., Back Dia. 4-3/4 In., Thickness 2 In., Arbor Size 5/8 In.-11, Rim Thickness 1/2 In., Back Thickness 3/4 In., Abrasive Material Zirconia Alumina, 16 Grit, Resin Bond Type, Max. RPM 6000, Specification 10828-QBX406 '