ABS Plastic Tweeter Mounting Bracket Washer Set for Car A Pillar Speaker Installation Suitable for speakers: no more than 2 inches high pitch , no more than 4 inches of mid-range The central hole is divided into two sections.<br> Install a 4-inch midrange speaker, then remove the washer to install a 100mm diameter 4-inch midrange speaker.<br> Install a 3-inch 3.5-inch midrange and use the washer on the pad.<br> (If you install a 3.5-inch midrange speaker to install the aperture and speaker cover, you need to pay attention to the car a column is than 111mm).<br> Tweeter Outer Diameter: 58mm<br> Tweeter Internal Diameter: 47mm<br> Mid-range External Diameter: 102mm<br> Mid-range Internal Diameter: 85mm<br> Maximum width of the bracket: 111mm<br> Bracket length: 270mm<br> color: White<br> material: plastic<br> Package Contents:<br> 4*Speaker bracket<br> Only the above package content, other products are not included.<br> Note: Light reflection 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.