The round hole design make the installation much easier than traditional rocker switches that typically require specialized tools or a lot of time to trim the rectangular cut out, whereas these switches only need a 1/2" round mounting hole.
Switch Name: Illuminated Rocker Switch
Switch Type: SPST - single pole single throw
Action: On / Off
Actuator: Rocker
Current Rating: 30A @ 12-14VDC
Mounting Hole: 1/2" Diameter
Terminal Type: 0.250" Quick Connect Terminals
Illumination: Green Light when switch wired properly with 12V input for SPST switch and ground wire for light.