Suitable for speakers: no more than 2 inches in height for tweeters, no more than 4 inches for 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 or 3.5-inch midrange and use the washer on the pad. (If installing a 3.5-inch midrange speaker with aperture and speaker cover, ensure the car pillar is wider than 111mm). Tweeter Outer Diameter: 58mm. Tweeter Internal Diameter: 47mm. Mid-range External Diameter: 102mm. Mid-range Internal Diameter: 85mm. Maximum width of the bracket: 111mm. Bracket length: 270mm. Color: White. Material: Plastic. Package Contents: 1 pair car speaker gasket. Only the above package content is included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +- 1-3cm.