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Column is made of seamless steel pipe, and the main girder is made of 1-beam girder or KBK light beam, rotating way can be manual(< 1t) or electric. JIB crane can be equiped electric wire rope hoist, electric chain hoist or manual hoist.
link:https://www.kinocranes.sg/jib-crane/jib-crane-by-capacity/heavy-duty-jib-crane.html
Heavy Duty Jib Crane | Kenancranes