The set contains plugs for cannons and machine guns of Czechoslovak Spitfires. There are three designs in the set, they differ according to the design according to the user. Thus, the first version for the leatdla of the former 310th Squadron (Air Regiment 10 and 12), the second for the 312th Squadron (Air Regiment 4 and 5) and the third for the 313rd Squadron (Air Regiment 7 and 8). All plugs are in a set of 2x, so it is possible to use a total of six models.