Horizontal Surface Mount Masthead Lights Fig. 0964 Horizontal Surface Mount Masthead Lights Fig. 0964 Description Chrome Plated Brass or Stainless Steel Top Black Polymer Base Technical Information Bulb : 12 Volt (Included) O.D. Base : 2 - 3/8" Screw Size : # 4 2 Mile Visibility Vertical Height 7/8"