Depressed Center Wheel,Type 27 wheels, designed for use on angle grinders, aggressively remove material by grinding on the perip Grinding Wheel/Abrasive disc, grinding, Dia. 4.5 In., Thickness 1/4 In., Arbor Size 7/8 In., Abrasive Material Aluminum Oxide, 24 Grit, Resin Bond Type, Max. RPM 16,616, For Use With Angle Grinder, Fast Metal grindting.For grinding metal,sainless steel,stone,etc.For Use ...