Speaker adaptors are needed when you want to replace the original one in you vehicle.Speaker adaptors are designed to allow you to fit aftermarket speakers into your vehicle.They are easy to fit and they fit securely.Universal speaker adaptors give you more speaker fitting Material: PlasticColor: blackOuter diameter: 24.4cm x 18cm (9.6 x 7.1 inch)Inner diameter: 22.4cm x 15.3cm (8.8 x 6 inch)Thickness: 2.5cm/1 inchApplication: for automobile's speaker repackingPackage include: 2x Car Speaker Adapter MountOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.