Attwood Plug-In Light Base This 2-pin base for pole lights with locking collars is well-suited for rough conditions or long poles. Attwood Light Armor Plug-In Light Bases have a threaded design feature that fits perfectly with the threaded locking collar now offered across the entire line of Attwood Pole Lights. This unique system ensures a tight and secure fit that prevents annoying rattling while underway or trailering. Features Threaded Locking System for a secure fit Unique cover design Stay