Drill tools include wet core bit and dry core bit for different processing. The wet core bit is mainly used for stone factories, while, if you don’t have access to water, use a dry drill. Both can be used for different materials, such as different stone materials, ceramics, glass, etc. It can be divided into different types of threads according to the machine it is installed in, such as M14, 5/8-11 for hand drill, and 1/2G for CNC machines.