Milwaukee M18 battery mount. Designed to be used in various locations such as in work vehicles, motorsports trailers, atv and offroad vehicles, workshop, and garages. Magnetic version has 2 large neodymium magnets with 70 pound holding force each. Made of strong high temp materials and precise tolerances to hold any Milwaukee M18 battery securely. Designed to completely cover the open end of the battery to serve as a protecting cover while holding the battery.