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Contact SupplierThe definition of a drill string is drillpipe with tool
joints attached. Drill stem is all those members between
the swivel and the bit, and it includes drill string, kelly or top
drive, subs, drill collars, heavy weight drillpipe, stabilizers,
shock absorbers, reamers and any other in-hole equipment
used generally or part-time during drilling operations (generally drill pipe thikness is 10 to 12MM)and the capacity is 20 to 35 ton.