Suitable for speakers: no more than 2 inches high pitch, no more than 4 inches midrangeThe 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 speakerInstall a 3-inch 3.5-inch midrange and use the washer on the pad.Specification:Tweeter Outer Diameter: 58mmTweeter Inner Diameter: 47mmMid-range Outer Diameter: 102mmMid-range Inner Diameter: 85mmMaximum width of bracket: 111mmBracket length: 270mmColour: as shownMaterial: PlasticPackage 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.