All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.
整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。
All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.
整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。
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