Features:* It is made of high quality YG6X alloy as raw material. The cutting head process strengthen the hardness of the drill bit.* Full grinding and anti-corrosion treatment, clean and sharp without burrs, the drill bit is more wear-resistant and more durable.* Small incision resistance, stable drilling, speed, no limit breaking. Opening neat, smooth, no broken edges, no shaking phenomenon, easy chips.* Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tile, marble, thin iron, mirrors and glass. Be sure to add water or coolant when drilling.* Suitable for different needs. It can be installed in general electric hand drill, bench drill. Specifications:* Materials: Cemented Carbide* Color: Black * Shank Diameter: 6.35mm (1/4")* Product Size: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm * Drilling holes for tile, brick wall, glass, wood, aluminum alloy, plastic, metal and other materials * Quantity: 1 PcPackage Contents:1 * Universal Drilling ToolNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.