Features: *It is made of high quality YG6X alloy as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness. *Full-grinding and anti-rust treatment, clean and without burrs .The drill bit is more wear-resistant and more . *Fully automated polishing: Polished CNC is fully automated, each is unified. *Small incision resistance，feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. *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. *5 different sizes, suitable for your different needs.It Can be installed in the for GEneral Electric hand drill, bench drill. Specifications: *Material: Cemented Carbide *Color: Black *Size: 5/6/8/10/12mm *Total Length:92-114mm(approx) *Quantity: 1pc *Application: drilling concrete, walls, brick, ceramic, wood, glass, tile, stainless steel, etc. Package Contents: 1pc* Drilling Tool Notes: 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. Made from high-quality materials, our tools products are durable and affordable to meet your daily needs. Please check the product size and model before placing an order to ensure it is the product you need. When you encounter a problem, please contact us and we will help until the problem is perfectly solved. When you receive your product, whether you are satisfied or not, we want to hear your opinion. Every customer can enjoy free refund or exchange service for damaged/quality problem products.