RV 4PCS Boat LED Blue Courtesy Light Plastic Flush & Surface Mt.

This is a set of 4 pcs energy efficient and attractive blue LED round light with white plastic housing is ideal for interior and exterior courtesy lighting applications. Each lamp comes with 3 blue colored LEDs and waterproof. This light can be recessed mounted or surface mounted by attaching plastic lower rim included.

Waterproof IP67 Rating Depth: 0.83" inch

Flush Mounting Cutout: 1 3/4"
Surface mount cutout: 3"

To Install;
Remove the uppermost rim to reveal the clear plastic housing that holds the light. You will find two screwholes and you will affix the light to a flat surface with screws. Replace the rim and the light is ready for use. 
Connect the light wires with like color wires from your fixture (positive and negative terminals).