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Sintered granite diamond core drilling bit HUAZUAN Sintered Diamond Diamond Drill BitDiamond Sintered Diamond Drill Bits are also know as Sintered Diamond Core Drill Bits or Sintered Diamond Hole Saws.  These are professional quality, heavy-duty diamond drill bits designed for use on ceramic tile, porcelain tile, limestone, sandstone, marble, granite, quartz and other stone, plus bricks, masonry, concrete block, and concrete.  Water must be used for lubrication.Sintered diamond drill bits are not very effective for glass type materials or softer stone materials such as slate and are not recomm