speaker parts:Effective Height: 61 Overall Height:89 Diameter of Mounting: 245 Outer Dia: 256,Center Hole:68 speaker frameFeatures: 1) Material: 0.5 to 1.0; 2) Sizes: 3 '' to 15 ''; 3) Available treatment: Zinc plating, spray chrome, painting, spray plastic, electrophoresis Speaker frame