Perko's 0615DP2STS Stealth II Series LED Bi-Color Light has a horizontal mount. This LED bi-color light is certified for use on power driven vessels under 20 meters in length. It features an ultra low profile, low heat and a long life span. Constructed with stainless steel and features a polished finish. The dimension of the light are 2-1/2" length x 2-5/8" width x 5/8" height. The required screw size for installation is #8.