Increase boom reach with this CONTRX Telescoping Boom Jib Crane. A second I-beam is mounted beneath jib on two trolleys. I-beam can be extended or contracted to avoid contact with large machines or other obstructions. Extension can be sold separately to add to your existing crane, call for information. Made in USA.NOTE: CONTRX Telescoping Boom Jib Cranes are not available online. Call a Certified Product Specialist to verify your specifications and to order.