Features:- This is a brand new item- 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 / 13 / 16 / 20 / 25mmPackage Includes:1 x 5pcs Diamond tool drill bit hole saw set