Only a small hole for wiring and three screws for attachment. Designed and tested for extreme environments. Draws only 0.28 Amps of power. Each light contains 16 super bright LEDs.Overall dimensions: 3-9/16" L x 2-5/8" W x 3/4 H. The item "Low Profile Stainless Steel Surface Mount LED Docking Lights for Boats" is in sale since Friday, November 6, 2015. This item is in the category "eBay Motors\Parts & Accessories\Boat Parts\Electrical & Lighting". The seller is "whitesmarine" and is located in McCormick, South Carolina. This item can be shipped worldwide.