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https://www.saigaogroup.com/product/lifting-sub.html

Drill collar lifting sub is a special above ground tool for lifting drilling tools in oil and gas industry and geologic exploration. It resembles a pup joint, and is used to thread the upper connection of the drill string to make the drill string can be tripped in/out by elevator. As a short type drillstring component, a lifting sub looks like a completion tubing and it allows the secure and efficient handling tools that need the help of the drill pipe elevators.

As a professional oil well equipment manufacturers, SAIGAO GROUP specializing in design, research and development, processing and manufacturing, sales and export of machinery equipment, with leading products comprising various kind of mud pumps, down-hole motors, any kinds of screen pipes, cementing tools as well as any kinds of wellhead equipment.