2pcs 16mm Dry Diamond Drill Bit with M14 Thread Diameter: 16mm; Diamond Height: 10mm; Total Length: 62mm; M14 Thread for Angle Grinder Dry Drilling for Tile Porcelain Ceramic Granite Marble Stone The drill with cold wax inside helps to cool the bits Vacuum brazing technology provides a much longer service life than electroplated ones Delivery Quantity: 2pcs Note: The data are all manual measurements, please allow an error of 1 - 3cm, due to the difference in light and display, there will be a certain color difference, whichever is the actual object received. Delivery Quantity: (as shown in the main picture)