Suitable for speakers: no more than 2 inches high pitch, no more than 4 inches midrange The middle hole is divided into two sections. Install a 4-inch midrange speaker, then remove the washer to install a 102mm diameter 4-inch midrange speaker Install a 3-inch 3.5-inch midrange and use the washer on the pad. Specification: Tweeter Outer Diameter: 58mm Tweeter Inner Diameter: 47mm Mid-range Outer Diameter: 102mm Mid-range Inner Diameter: 85mm Maximum width of bracket: 111mm Bracket length: 270mm Colour: as shown Material: Plastic Package Contents: 1 Pair x car speaker gasket(not included speakers) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.