The MasterCraft Boat Speaker Cover is a sleek addition to your audio setup. Made of durable billet aluminum, this tweeter grille measures around 2 1/2" in outer diameter and 3/4" in depth. It features (6) 1/8" diameter mounting holes, spaced 1 7/8" apart center to center (hardware not included). Ideal for protecting your speakers while adding a stylish touch to your boat's interior.