Features:

• Full 2" to 7" range (50.8 - 177.8 mm) Controlled pressure assures positive, adjustable contact through full range
• Three stones provide more cutting surface and assures quick removal of cylinder glaze
• Adjustable stop-collar permits quick selection of two range settings, from 2" to 4" and from 4" to 7", 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 cross-hatch pattern when removing tool from cylinder
• Furnished with 180 grit stones