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.Install a 4-inch midrange speaker, then remove the washer to install a 100mm diameter 4-inch midrange speaker.Install a 3-inch 3.5-inch midrange and use the washer on the pad.(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 wider than 111mm).Tweeter Outer Diameter: 58mmTweeter Internal Diameter: 47mmMid-range External Diameter: 102mmMid-range Internal Diameter: 85mmMaximum width of the bracket: 111mmBracket length: 270mmcolor: Whitematerial: plasticPackage Contents:1 * pair car speaker gasketOnly 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.