The mines consist of a small TNT explosive charge inside a hollow cylindrical-cast iron fragmentation sleeve.
The sleeve has large fragments cast into the outside and is open at the bottom to accept the insertion of a wooden or plastic mounting stake.
The effective radius of the mine is often quoted as four meters at 360 degrees, but a small number of large fragments may be lethal at ranges far exceeding that.
The wooden stakes tend to rot in tropical climates, leaving the mine, if armed, in an extremely unpredictable state.
Being of simple construction, these mines have been widely copied, including non-standardised patterns from informal guerrilla workshops.