"Easily and securely connects horizontally to I-beam and H-beam flanges providing a single worker with a moveable anchor system. Once attached, the anchor easily slides along the beam with the worker, providing increased mobility, safety and productivity. Constructed of lightweight aluminum and bronze, it's adjustable and easy to install. This unit fits flange sizes 3"" to 14"". When the ShadowLite Beam Anchor is attached at a workerÃ†s feet, a double shock-absorbing lanyard is required to keep fall arrest forces within OSHA requirements. Meets all applicable OSHA, ANSI and CSA standards.Ships Direct F.O.B. Mfg."