7. Geological Drilling Pipe (YB235-70) is for the use of the geological department of the steel core drilling, can be divided by use of drill pipe, drill collars, cores, sleeves and precipitation tubes.

8. Diamond core drilling Seamless (GB3423-82) for diamond core drilling drill, core rods, seamless steel casing.

9. Oil drilling pipe (YB528-65) is used to thicken the oil drilling within or outside the thick ends of the seamless steel tubes. Steel wire and non-sub-car wire two car, car connector wire useful links, not threading methods and tools useful butt joint connection.