Measures 3-1/2″ diameter across the light face, at the widest point. Overall length is 16-1/4″, with 7-15/16″ between mounting holes (measured center-to-center). Hardwired with three plain wires – both light colors are a single function. There is one ground wire for both the amber and blue functions, and one hot wire for each color. Includes foam rubber gasket and mounting hardware. Sold SINGLE.