Miller Shadow beam anchors connect horizontally to a wide range of I and H beam flanges from 3 inches to 24 inches wide and up to 2-1/2 inches thick. Models 8814 and 8816 slide along the beam with the worker to provide increased safety, mobility and productivity. Model 8815 is a fixed unit and is designed to be tightened horizontally or vertically, firmly gripping the beam or column to provide a temporary or permanent anchorage attachment. 400 lbs maximum capacity. Complies with OSHA and ANSI Standards.