Screw Terminating RCA Panel mount connector. The BTX-MXRCA includes 6 isolation washers (red,green,blue,black,white and yellow) with each connector. By including all 6, you can keep just one part on the shelf and use it for all audio and video applications. Mounts in a 0.375" round hole when used without an isolation washer. Mounts in a 0.453" round hole when used with one of the included isolation washers.