The K-1 plastic antitank mine was developed in East Germany about 1958 at the same time as the K-2 plastic antipersonnel mine was developed.
Since then, it has undergone minor modifications in respect to the detonator and fuze, but the mine has remained essentially the same.
The K-1 has two fuze wells, the larger center one for the normal pressure fuze, and a smaller one for a pull fuze for boobytrapping.
The pull fuze requires very little tension.
After both fuzes are armed, the mine is placed upside down on the ground.

Diameter: 250mm , height: 150mm.
Weight: 11kilo including 7.5kilo TNT
Operating force: 150kilo.