5pcs 3/16" Dry Diamond Core Drill Bits for Ceramic Porcelain Tile Granite Marble Glass Hard Materials Diamond Hole Saw Kit with Cooling Wax,Round Shank

Dry Drilling Design:With sharply ground & extremely hard diamonds, the diamond drill ensures a professionally clean and fast drilling.Filled with cooling wax, it is used for cooling and lubricating in the drill bit, so you can drill holes without adding water, suitable for dry drilling.

Stable and Durable: diamond drill bits for dry drilling, stable drilling.

In addition, it has a long service life thanks to high quality and temperature-resistant diamonds.