Item Type: Hole drill bit Color: Blue Material: Diamond Size: Approx. 72 x 8mm / 2.8 x 0.3in Hole Diameter: Approx. 8mm / 0.3in Uses: Suitable for drilling holes in marble, concrete, granite, ceramic tiles, glass, etc. 1High& 8209;quality diamond material helps hole drill bit with high hardness and durability. 2Strong hole opening performance, fast drilling speed, smooth drilling without seamless. 3Using high& 8209;quality diamond brazing technology, of sharpness tooth edges, smooth openings without broken edges, no vibration. 4Diamond hole drill bit can be suitable for drilling holes in marble, concrete, granite, tiles, glass, etc. 5Practical adoptability helps hole drill bit with high performance and you can use for a long time.In manual measurement, due to manual weight measurement, please allow an error of 1?3mm, thank you for your understanding.5 x Hole Drill Bit