Package: 1 x car subwoofer cover; with 4pcs screws Metal material, sturdy and durable Dimension: 11" x 6" x 1.5"/28 x 15.5 x 3.7cm(L*W*H), as shown in the picture. Wall screw holes??? center spacing: 11.12 inches; Fitment: fits for 10" subwoofer Note: Please make sure if its size can match your speaker before purchasing.