This defensive grenade was made of cast iron with a pressed steel plate, fixed by screws, on one side.
Inserting a finger into the cap secures the striker so that the safety could be switched.
After releasing the grenade, the cocked striker would hit the primer, fires the delay resulting in detonation.
Duds occurred when the finger did not release the striker fast enough, the striker would not hit the primer hard enough..
Largest diameter :
Smallest diameter :
Weight 65gram including 28gram trotyl.