The Alpha Communications SQLK-8L is a square baffle designed to mount standard 8" loudspeakers in areas where abuse to the speaker is anticipated. It may also be adapted to mount various re-entrant horns. It's one-piece heavy cast aluminum is reinforced with a sturdy perforated steel plate that prevents damage to the loudspeaker cone. For maximum security, tamper-resistant spanner screws are supplied for mounting the grille directly to the protective enclosure or mounting device.