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 ... NO.: DA115-6-4Item #DA115-6-4Wheel TypeGrindingDia.4.5 In.Thickness1/4 In.Arbor Size7/8 In.Abrasive MaterialAluminum OxideGrit24Bond ...