M421fragmentation mineM421is a copy of the Belgian NR-413 tripwire-initiated anti-personnel fragmentation stake mine. Once armed (by the removal of a safety pin), pull on any of the tripwires lifts the striker and compresses the striker spring. A retaining ball then escapes to release the striker onto the stab-sensitive detonator assembly.Diameter: 46mm Height: 114mm Weight: 640g Explosive: 100g Range: 15m Explosive/filler type: Composition BPortugal