Advantage: Car audio speaker spacer ring aid in audio speaker installation, play an important part in reducing resonance and making the speakers stronger. Replace new car speaker spacers adapter, provide better sound quality,fixed speakers to reduce door resonance. The ring mounting bracket is good partner for mounting new speaker. You can install the speakers you want by adding extra depth. Material:Speaker mounting bracket ring made of good ABS material, will not oxidize moisture-proof, durable, wear-resistant, long service life, smooth surface, not easy to fade, no scratches.Functionality: Material:ABS Fit for Speaker Dia:6.5" Depth: 40mm / 1.57" Inner Diameter 1: 146mm/5.75" Inner Diameter 2: 136mm/5.35" External Diameter 1: 184mm/7.24" External Diameter 2: 163mm/6.42" Compatibility: the speaker ring fits most 6.5 inch speakers. for VW Golf 4 IV from 1997 to 2003 (front door, rear door) for VW Golf 5 V from 2003 to 2008 (rear door) for VW 3B BG from 1996 to 2005 (front door + rear door) for VW Variant 3B BG from 1996-2005 (front door + rear door) for VW Polo 9N 9N3 from 2001 to 2009 (front door + rear door) Installation Steps:Speaker mounting bracket ring installed on the car audio system, utilizing existing vehicle mounting points without cutting or drilling.Package Content:2 Set Subwoofer Speaker SpacerAttribute:This product is a speaker mount recessed bezel spacer and without internal speaker ring.Kindly Know:Please ensure this part is suitable for your vehicle before purchasing.