The rock drills (tube drills) is one kind of special drilling tool, through cuts a ring channel, the core may die or the bits for a drill is stave. Is suitable in turning on lathe digs when the drilling machine sneaks in sets upright the hard weak decency and so on flinty rock layer, ordinary sneaks in the way to receive the rock the bit pressure and the torque disperses to the entire flagstone on, by now used the core container to drill may carry on after the rock layer the link cuts the sample, facilitates the next construction to be able a smoother enhancement to sneak in the efficiency. 

It is suitable for Bauer Germany or Sany Drilling machines!!