Contour Anchor Light - 20" - Black Shaft/White Base The design says it all, unobtrusive, durable, reliable with striking good looks. The Contour Anchor Light has the slimmest profile in the industry, a retractable locking base with a small footprint, a simple 2-wire hookup, and is constructed from durable composite plastic to reduce weight. U.S. Coast Guard approved for 2 nautical miles.