"Under-structure design for use in areas with low ceilings. Precision-tapered bearing for jib boom rotation. Full 180 rotation for use in most applications. Painted blue finish. Complies with OSHA, ANSI and CMAA specifications. NOTE Customer must ensure unit is properly installed and floor strength is adequate to support job crane usage. Trolley and hoist not included. U.S.A. Load Capacity lbs. 600, I-Beam to Ground in. 57, I-Beam H x W in. 6 x 3 5/16, Overall Height in. 63, Overall I-Beam Length in. 88, Usable I-Beam Length in. 80. Designed to assist workers in the maneuvering of materials as well as achieving maximum headroom where low ceilings are of concern Cantilever style jib crane mounts to true vertical wall members Increases personnel productivity by lifting awkward materials Hoist and Trolley sold separately"