'Square Tip Grinding Plug, Grinding Cone Type 18, Grinding Cone Diameter 1-1/2 In., Grinding Cone Length 2-1/2 In., Arbor Hole Size 5/8 In.-11, Abrasive Material Aluminum Oxide, Abrasive Grit 24, Max. RPM 24, 190, Specification 57A24-R'