Description: Materials: Cemented Carbide Product Size: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Shank Size: 6.35mm (1/4") Package Contents: Universal Drilling Tool *1 Drilling holes for tiles, brick walls, glass, wood, aluminum alloy, plastic, metal and other materials Specifications: ➊HIGH-QUALITY MATERIALS It is made of high quality YG6X alloy as raw material. The process of the cutter head strengthen the drill hardness.   ➋SURFACE ELECTROPHORETIC PAINT PROCESS Full-grinding and anti-rust treatment, clean and sharp without burrs .The drill bit is more wear-resistant and more durable .Fully automated polishing: Polished CNC is fully automated, each one is unified.   ➌UNIQUE CROSS ANGLE DESIGN Small incision resistance，feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily.   ➍WIDE USAGE Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, mirrors and glass. Remember to add Water or coolant when drilling.   ➎7 DIFFERENT SIZES Suitable for your different needs.It Can be installed in the general electric hand drill, bench drill. Package Included: 1* Multifunctional Drill Bit