speaker frame :Effective Height: 91mm Overall Height:117.8mm Diameter of Mounting: 375mm Outer Dia: 387.5mm,Center Hole:70mm speaker frameFeatures: 1) Material: 0.7 to 0.9; 2) Sizes: 5 '' to 18 ''; 3) Available treatment: Zinc plating, spray chrome, painting, spray plastic, electrophoresis Speaker frame