ATD Tools 5430 ATD-5430 3" Stone-Type Glaze BreakersFull 2" to 7" (50.8 to 177.8) range. Controlled pressure assures positive, adjustable contact through full range. Adjustable stop-collar permits quick selection of 2" to 4" and 4" to 7" range settings and serves as safety stop if tool is extracted from cylinder while turning. Operates with any electric drill. Easily compressed with one hand to eliminate vertical scratches which might spoil the diamond crosshatch pattern when removing tool from cylinder. (3) 3" stones provide more cutting surface to assure quick removal of cylinder glaze. Furnished with 220 grit stones. Replacement hone ATD-5431.