Installed a JBL PRV-175 radio, JBL MS6510 6.5" speakers, Kenwood P-WD250MRW 10-Inch Marine Subwoofer and Amplifier, Enrock USBAUX2RC 3.5MM and USB mount, Enrock EKMR1 Antenna with some Kicker KW16 speaker wire into my Pro-Line 25 Walk after my overhead console radio mount broke. I did not want to try and fish the wire through my hard top so this was the best option by far for what I wanted. It fits in a standard size Tach hole (3.5" diameter).