Product Description Outer Diameter: Approximately 157-188mm Inner Diameter: Approximately 148mm Thickness: Approximately 21mm Included: 8 screws / 2 backing sheets Material: Aluminum Alloy Features: Waterproof, Vibration Resistant Application: 6.5-inch Aluminum Alloy Toyota Speaker Ring Effects: Effectively suppresses resonance in the speaker mounting area, improving mid-range clarity and enhancing low-frequency depth. Can resolve installation depth issues for some speakers. *Some modification may be required depending on the vehicle. Please confirm the speaker size and depth before purchasing to determine compatibility. ///////////////////////////////////////////// Management Code: CAI SG4533 /////////////////////////////////////////////