Package includes:6 PCs toggle switch, 6Pcs Red Cover. Can be Use as a switch for various additional electric equipment inside & outside the car. 6Pcs Cover Toggle Switches, Red Cover Rocker Toggle Switch, Car Auto Switch On/off (12V 20A Red). how to install: Open the red cover, toggle the switch to 'on'. Close the red cover to off the switch directly. Mounting hole diameter: 12mm. Each of the terminals has a machine screw for quick connections, but also easy to be soldered. Easy to use and install: Open the red cover, toggle the switch to 'on'. Close the red cover to off the switch directly. Mounting hole diameter: 12mm. Each of the terminals has a machine screw for quick connections, but also easy to be soldered.