The Schü-mine 42 was a German anti-personnel mine used during the Second World War. It consisted of a simple wooden box with a hinged lid containing a 200-gram (7.1 oz) block of cast TNT and a ZZ-42 type detonator. A slot in the lid pressed down on the striker retaining pin, sufficient pressure on the lid caused the pin to move, releasing the striker which triggered the detonator.