10Pcs Diamond Tool Drill Bit Set Dot Hole Saw Cutter Glass Marble Tile 8-50mm

Features:
Brand New & High Quality!
This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and just needs water for lubrication. 
Works better with a electric drill (not included). 
Easy to use, start your hole diagonally, make a round trace and then hold drill straight.
Good performance and long life.
Excellent for making neat and accurate hole on glass and tile.
Size: 8/10/14/16/18/22/26/38/45/50mm
This glass hole opener drill is made of sturdy material, which is more durable and sturdy.

How To Use:
1. The drill position on the marble 30 degree , then open a pit on it
2. Slowly up the bit to 45 degrees, and then gently drill
3. Continue up the bit to 60 degrees and then gently drill
4. Up to a certain point of angle, continue to drill
5. Finally reached 90 degrees , add some water in the drill pipes for cooling, extend bit life

Package Includes:
1 x 10pcs Drill Bit Hole Saw

Note:
When using the bit please add water to cool down the temperature to prevent core drill being burnt and extend its service life.