Description: Type: (25mm) hole and the switch will sit in nicely;no more square cut outs The switch comes with a kyhole slot to prevent unwanted rotation SPST 2 pole design (On/Off) 3rd poles with LED to be connected to earth GROUND connect to power(-);POWER connect to power(+) The middle LOAD connect to the light(+) Specification: Housing Color: Black Light color: Green LED Volt: DC 12V,25A Type: 2 Pins (3 Pins with LED) SPST: ON-OFF Size: about 2.9 cm x 2.9 cm x 3.3 cm(LxWxH) Package Includes: 5 x LED Round Switchs Note: It can be applied as the switches for the additional electronical equipment inside&outside the car.(such as flashing lights,chassis lights,and dome lights)