① drill. The working end of the drill bit

is drilling work directly in the bottom of the hole broken rock. Drilling String Crossover Sub Steel drill bit body and at the end of the inserts welded with hard alloy cutting tool or diamond particles composed. With the core bit body with a threaded pipe connection, inverted cone drill bit body for mounting lifting off or put in the material, so that the card off the core.
② core tube. Core is accommodated in the drilling cores, but also bear and pass WOB and torque to drive the drill work.
③ Reducing joint. It is used to drilling jars manufacturers connect the core pipe and the drill string.
④ take powder tube. In large rock powder, rinse insufficient liquid amount, collect large grain cuttings. Especially when drilling grain drilling must take powder pipe band.