M2's Heavy Duty Fiberglass Cross Boom has been developed to work with the Yaesu G-550 Elevation Unit or G-5500 AZ /EL Unit. It allows solid clamping to the Cross Boom without crushing thin wall fiberglass tubes. The unit consists of a center solid 18" aluminum rod and (2) 2" x 1/4" wall x 60" long fiberglass tubes. The solid aluminum rod and thick wall fiberglass tube will give you the ability to secure large systems or arrays for years of solid slip free service. *Total length of unit when assembled is 11' or 132".