Designed for Evolution Series Poke-Thru Devices, RFBE Series Floor Boxes and CRFB Series Floor Boxes, Evolution Heavy-Duty Round Covers provide high-strength and corrosion resistant access to power, communications and audio/visual services recessed below floor level. Evolution Series Heavy-Duty Round Covers are the perfect fit when heavy equipment use is common or the layout of the space changes frequently. These covers are an ideal solution for airport terminals, ballrooms and entertainment venues.