Description: High-quality materials use high-quality YG6X alloy as raw materials. Bit oxynitriding process strengthens the hardness of the bit. Surface electrophoresis painting process Fully polished and anti-corrosion treatment, clean and neat without burr. The drill is more wear-resistant and more durable. Fully automatic polishing: CNC polishing is fully automatic, each one is uniform. Unique cross angle design. The cutting resistance is small, the drilling is stable, the speed is fast, and the edge is not broken. The hole is neat, smooth, no broken edges, no shaking and not easy to break. Widely used Professional glass and tile drill bits can drill tiles, marbles, thin iron, mirrors and glass smoothly and accurately. Remember to add water or coolant when drilling. Various sizes suitable for different needs. Can be installed on general hand drills and bench drills. The range of the machine drill is 10mm and more. Specification: Material: Carbide Color: Brown (as pictures show) Quantity: 5/10 pcs Product size: (optional) 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Package content: (size is up to you) 10 * drill bit ( 3mm or 4mm or 5mm or 6mm)5 *Drill (8mm or 10mm or 12mm) Note:1. The real color 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.