Check the listing for details. 10pcs Diamond Hole Saw Kit Drill Bits Set Cutter Glass Ceramic Tile Porcelain. Color: Silver, Condition: New. Listed at 7.86 USD. Features:1.100% brand new and high quality.2.Environmental protecting and easy to use.3.Please start drill at 45 Degree to surface and align to 90 Degree as hole forms.4.It is perfect for glass ceramic marble tile granite.5.Simple to operate and convenient to use.6.The diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials.7.Works better with a electric drill. (Not included)Specifications:--10Pcs (included:6/8/10/12/14/16/18/20/22/30mm) Color: SilverMaterial: Nickel PlatedPackage Included:10 x Diamond drill bit hole saw set 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.