9Pcs 10mm-50mm Diamond Coated Marble Ceramic Tile Glass Porcelain Drill Bit- Easy to use， high quality. good performance， long life- Excellent for making clean and accurate hole on glass ， tile and marble- Works better with a electric drill( Excluding in this item )When using the bit please add water to cool down the temperature to extend its service lifeSpecifications:Material: MetalSize: 10 / 14 / 16 / 18 / 20 / 26 / 32 / 45 / 50mmPackage Includes:1 x 9pcs Diamond tool drill bit hole saw set