Diamond hole saw / core drill style bit. 10 Sizes: 6mm, 8mm, 10mm, 14mm, 16mm, 18mm, 22mm, 35mm. 40mm, 50mm Application: Drill Glass, Tile Bottles, Blocks Jars, Fiberglass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone SPEED KILLS: Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably Warrnings: Not for use on Concrete or for depths beyond about 1/2"; Enough water is MUST HAVE for lubrication and cooling when drilling Description in details
Material: steel
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): 6mm, 8mm, 10mm, 14mm, 16mm, 18mm, 22mm, 35mm. 40mm, 50mm.
Total length: about 5.5cm
Applicable Industry: Suitable for Stone, Tiles, Ceramics, Glass and Granite, etc Processing.

Standard form & Use note
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".