This is a Czechoslovak round anti-tank mine of minimal metal purpose with a Bakelite casing. The mine entered service with the Czech and Slovak armies in the 1950s. The mine has a traditional layout with a central pressure plate and a donut-shaped main charge surrounding an accelerator charge. It can use the RO-7-1, RO-7-II pressure-activated, or RO-7-III pressure-activated/prevent extraction detonator. The mine's detonator is the only component containing metal and is limited to a spring, striker, and detonator cap.
The PT Mi-Ba anti-tank anti-track mine is designed to mine the terrain in order to destroy enemy combat and other equipment.
The mine is made in a plastic case and is equipped with TNT. In the lower part there are two holes, closed with plugs, for pouring in the explosive. When the mine is triggered, its pressure cover breaks off along the perimeter and, lowering, affects the drive of the Ro-7-ll fuse.