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1/2 X 1-1/2 X 1/8 40 Grit Aluminum Oxide Straight Cartridge Roll. Cartridge Rolls Are Cylindrical In Shape Enabling The User To Grind Or Finish Hard-To-Reach Areas Of A Work Piece Such As Angles And Curves. Its Small Size And Shape Enable It To Blend, Deburr And Polish Inside Holes And Diameters Or On Irregular Surfaces And Contours.