What are the sizes and sizes of common drilling rigs?
As for the tube size, see what you call formation, deep, large hole diameter ratio of 100 or 200 and, of course, reamer, reamer adjustable length, is not to say, not seen under the casing, heard the longest tube 17 meters, to docking 3 times!
There is a slot on the drill bit. When we buy the drill, we have a reamer, which is mounted on it and then drilled, so that the upper part of the hole is enlarged.
Theoretically, how big holes are needed for construction, and how large the drill bits are. The common basic 200, one unit, 600800, and 160018001500 are also available... The big one is 25002800
