#312 - The Magnum Mag Base at an even 12" x 1" wide allows for quick layouts and features five neodymium rare-earth magnets, laser engraved Imperial (U.S.) rules and incorporates a "Jack Screw" System to quickly set any intermittent slope/grade. With the ability to hold over 20x its weight, the Magnum Mag Base is a great Compliment to any 660 or 880 series laser torpedo