ITEM NAME:Diamond Drill Bits - Glass and Tile Hollow Core Drill Bits Extractor Remove X9O4 Diamond Drill Bits - Glass and Tile Hollow Core Drill Bits Extractor Remove X9O4 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 1/2inch; Water is required for lubrication when drilling Applicable Industry: Suitable for Stone, Tiles, Ceramics, Glass and Granite, etc Processing. 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). Material: steel colour: Silver specification:1x6mm, 1x8mm, 1x10mm, 1x14mm, 1x16mm, 1x18mm, 1x22mm, 1x35mm. 1x40mm, 1x50mm Size: 200*60*60mm Included: 10pcs x Diamond bit set Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..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.