Model SM-BR includes a pair of galvanized steel rails and screws. The rails are made for use with Lowell SM Series sound masking speakers. To mount the rails to the speaker, remove and discard the sound masking speaker's hangers and place the speaker face downward. Locate the six pilot holes in the rear of the enclosure and six holes on either end of the rails. Use the six Phillips head screws (provided) to attach the rails to the bottom of the speaker.