Attwood Plug-In Light BaseThis 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 Stays secure while underway or trailered; Low-profile prevents water from pooling on top surface;