Hubbell-Raco 165 Octagonal Box, 21.5 Cu-in, 4 in Dia X 2-1/8 in D, 4" With proper fitting can be used for conduit, nmsc, armored, metal clad, flex cable Durable pregalvanized steel construction Designed to support a static light fixture of 50 lbs. Or less. This octagon box is not suitable for ceiling fan support The product is ul listed 21.5 cu. In. Wiring capacity Drawn or Welded : Drawn