20 ItK 40 VKT or 20 mm dual anti-aircraft cannon model 1940 manufactured by VKT was a Finnish light anti-aircraft gun designed by the Finnish gunsmith Aimo Lahti. As the only multi-barrel 20 mm anti-aircraft gun 20 ItK 40 VKT was the most effective 20 mm air defence weapon used by the Finnish Army during World War II. A total of 174 guns were built, used in training until 1970s and kept in reserve until 1988. The gun received the nickname Vekotin (gadget) from Finnish soldiers. The nickname was reached by adding to the abbreviation of manufacturer, VKT.