TiSO mechanical Tire-Killersare an ideal solution for vehicle access control when a power supply is unavailable. TiSO offer two types of such devices: spring loaded or lever drive. In the first case the spikes always remain raised and one direction free to pass. The lever operated tire killers provide three operation modes: spikes up and blocked to both directions, spikes down and blocked, spikes up and free to one direction. Available in a variety of blocking widths and spike lengths (standard 80 mm or 170 mm), as well optional installation configurations: surface / above ground or submerged to ground level.