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5/16 Diamond Drill Bit 5/16 in 3 Pack for Porcelain Tile Drill Bit Glass Drill Bit Diamond Tip Bit with Core Guide to Hold in Place and Prevent Jumping 8mm Porcelain Drill
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5/16 Diamond Drill Bit 5/16 in 3 Pack for Porcelain Tile Drill Bit Glass Drill Bit Diamond Tip Bit with Core Guide to Hold in Place and Prevent Jumping 8mm Porcelain Drill