This compact aluminum baffle/enclosure is identical to the 410 Series with the addition of a circular mounting canopy complete with mounting hardware and second grille to enable bi-directional sound dispersion. Model 510-4 mounts a standard 4" (102mm) speaker. Aluminum housing is patch-jute lined and undercoated to allow clear, audible speaker performance by preventing mechanical and acoustic resonance. One grille per unit includes studs for convenient speaker mounting. Complete assembly installs to a 4" (102mm) octagon E.O. box (by others). Finished in satin brushed aluminum.