Manufactured with box beam style aluminum construction and then precision milled for elite durability, this level also features three 33% higher visibility epoxy-locked acrylic block vials that deliver an accuracy of 0.. The Spec Ops Magnetic Box Beam Level with Bungee features a Patented Tourniquet Bungee System that securely mounts the level to plastic pipes, 2x4s and other surfaces, while the rare earth magnets on the bottom securely grip to magnetic surfaces.