The Minenabwurfvorrichtung was a simple device consisting of a small steeltube oriented at a 50° angle mounted to the hull roof or track guards of the tank. The tube contained a modified version of the infantry S-mine equipped with the Glühzünder 28 fuze which allowed it to be electrically fired from the inside of the vehicle using a small control panel labeled Minenabwurfschalter that was mounted on the engine firewall. The mine itself consisted of a round projectiledeep by wide and contained about 360steelballs. The projectile was fired about into the air, where it would explode, scattering the steel balls in all directions. Starting in June 1942, up to six launchers were mounted on the track guards of an unknown number of Panzerkampfwagen IIIAusführung L tanks and were issued for troop testing to the 13th Panzer Division. The device was subsequently adopted as standard equipment on new productionTiger I tanks during January through October 1943. On the standard Tiger I, five launchers were mounted around the periphery of the hull roof, one at each corner and one halfway along the left hull side. As future plans were being made to install the 360° traversable Nahverteidigungswaffe, fired from the interior of the turret, the Minenabwurfvorrichtung was discontinued in early October 1943 after only a few hundred Tiger Is had been equipped with them.