Panel Mount Base for 1 or 2 Pole Murray MP, Siemens QP or Other "Interchangeable" Design Plug-In Circuit Breakers. Converts a Plug-In to a Lug-Lug Feed-Through Application-125A Maximum. Ideal Replacement For Older Breaker Enclosures, RV Marina and Campground Power Outlet Boxes. Measures 5.06"H X 2.12"W - MT700