Specifications:

Material: Nickel Plated
Good Performance and long life.
Excellent for making clean and accurate hole on glass and tile.
Works better with a electric drill (Excluding in the item).
Size(outside diameter): 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.63",18mm/0.71", 20mm/0.79", 22mm/0.87", 25mm/0.98", 50mm/1.97"
Applicable Industry: Suitable for Stone, Tiles, Ceramics, Glass and Granite, etc Processing.
These Diamond Bits are Capable of Drilling into Extremely Hard Materials Such as Stone and Glass. Use a Low Speed Setting and Proper Cooling, Such as Water, to Ensure Longer Lasting Life.
Use With any Drill or Power Tool
Superior Performance - Cut Holes in Marble, Slate, Glass, Tile, Stone, etc...
Great for Home, Hobby, Craft, Construction, etc

Tips:

1.Start your hole diagonally, make a round trace and then hold drill straight.
2.Always use lubrication (water), otherwise the diamond core drill will burn.
3.Low drill pressure and increased use of water lubrication will extend drill bit life considerably.
4.Not for use on Concrete or for depths beyond about 1/2".

• Material - These diamond drill bits made of high-speed steel that is durable and have a long sevice life.
• Diameter - 10 Sizes: 8mm/0.31", 10mm/0.39", 12mm/0.47", 14mm/0.55", 16mm/0.63",18mm/0.71", 20mm/0.79", 22mm/0.87", 25mm/0.98", 50mm/1.97"
• Ideal for - Drilling in glass, tiles, marble, granite, wood and other flat surfaces and making clean and accurate hole on glass and tile.
• Good choice - This diamond drill bits set is a great gift for any DIY lover.
• Note - When you using the diamond drill bits, please use lubrication (water),otherwise the diamond core drill will burn.

Material - These diamond drill bits made of high-speed steel that is durable and have a long sevice life.Junda