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3/8 to 1/2-In. Utility Drive Arbor
Master Mechanic, 3/8" - 1/2" Utility Drive Arbor, With 1/4" Shank.Adapts 3" & 4" Wire Wheels With 3/8" Arbor Holes To Drill, For Use On 4" & 6" Buffing Wheels with 1/2" Arbors.