FA51-4 Round Grill for 4" Strategy Speakers by Atlas Sound. If you are looking for a functional and economic round grille, then FA51-4 round grille is what you need to have. This features a one-piece, stamped, perforated opening which is compatible with most ceiling styles.
The grille's 1/8" diameter holes are equally spaced, forming a perforation pattern which allows for high-quality sound transmission.features a one-piece, stamped, perforated opening which is compatible with most ceiling styles.