Two-mile, 360° visibility for use on boats up to 39.4' (12 meter).An economical way to meet ABYC A-16 standards. Anti Glare lens. Black plastic tube. Easy to operate with hourglass design knob. Adapters included to allow for angled or flat surface installation. Comes with both horizontal (2-1/4 x 2) and vertical (3 x 3/4) mounts. Base mounts with two required #10 fasteners.