speaker parts:Effective Height: 20
Overall Height: 29.5
Diameter of Mounting: 138
Outer Dia: 154*154,Center Hole:30

speaker frame

Features: 1) Material: 0.5 to 1.0;

               2) Sizes: 3 '' to 15 '';

               3) Available treatment: Zinc plating, spray chrome, painting, spray plastic, electrophoresis