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{Material}: pvc, copper and gold-plated metal.beautiful and high quality, effectively avoid from corrosion and rustiness. {Specially Designed for DIY}:This terminal box with 2 mounting holes is designed for DIY applications, where a replacement of the original speaker board is required.thicken base plate for reducing the resonance of wire box. {Surface Pure Copper Plated}:speaker terminal binding post,Gold plated posted with gold plated red and black knobs, spring loaded connection posts for raw wire {Dimension }:Overall measurement of 3" round, cut out measurement of 1.938" round {Wide Compatibility}:suitable for home, hotel, hall or the other places you want to set a speaker.Use for speaker cabinet, home speaker, car speaker, etc