KATUR 50mm Dia Diamond Hole Saw Drill Bit, Slate Porcelain Marble Hollow Core Drill Bit for Glass, Ceramic, Porcelain, Tile, Marble, Granite (50mm Diameter)

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Other factors that cause friction and overheat the drill are a high RPM and drilling with too much force. To summerise, use a slower drill speed, use less pressure and use the tile rite cooling system + guide. A.Diamond drills MUST be cooled with water, If you fail to use running water with a diamond drill it will overheat the diamonds and turn blue.