8inch One-Way Vandal-Resistant Speaker Steel mesh security baffle prevents objects from penetrating the speaker - Tamper-resistant faceplate screws resist removal - Mouonting holes for single-gang double-gang or octagon outlet box or attachment to any solid surface - Knockout for 1/2inch or 3/4inch conduit - Heavy gauge steel construction - Gray powder coat finish custom colors available on request - 8inch self-amplified speaker with adjustable volume - Easy mounting to any solid surface (V-9808) - Direct fit for Valcom vandal-resistant enclosures (V-9807 V-9809 V-9885)