Features: Brand new and high quality Made of high quality hard alloy material. The process of the cutter head strengthen the drill hardness. Full-grinding and anti-rust treatments, clean and sharpness without burrs. The drill bit is more wear-resistant and more durable. Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor-phenomenon, chip easily. Professional tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, wood and metal. 5 different sizes suitable for your different needs.It Can be installed in electric hand drill. Specifications: Material:Hard Alloy Type:Industrial 5mm/Professional 6mm/Professional 8mm/Professional 10mm/Industrial 12mm Size:As shown in the figure Package Includes: 1x Tile Drill Bits note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.