Manufacturer locking kelly bar frictional kelly bar and kelly bar's accessories match for all types rotary drilling rigs

Manufacturer locking kelly bar frictional kelly bar and kelly bar's accessories match for all types rotary drilling rigs

Type:(1)locking kelly bar (2) Frictional kelly bar
Diameter: 377-508mm
Sections: 3-6
Material: 27SiMn or 35CrMo

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