Model: JKT04 - Quantity: 1 piece - Color: Silver - Material: Hard alloy - Diameter: 16mm - Suitable for hard and brittle materials such as ceramics glass granite tile and brick walls - Triangle ceramic glass drill bit diamond wheel sharpening carbide tips for accurate centering drilling high temperature brazing carbide tips straight drill shank - Meets the national standard specifications make sure that the openings neat smooth and without broken edges which will not produce tremor phenomenon - It can be mounted on an ordinary hand drill. Need to add coolant (water turpentine or gasoline) please make your drilling gently - Long lifetime and high quality - Packing list: -1 x Drill bit