The 1915 discus grenade functioned exactly the same as the first type.
It's body was made of pressed steel of about 1mm thick.
The fuze assembly was made of an alloy with 4 brass end screws.
Throwing the discus in a rotating way, the plungers were driven outwarts by the centrifugal force. This was its safety during flight.
Striker pins are uncovered as the safetypen falls out during flight.
On impact, one, or possibly two plungers (with primer), would drive itself onto one of the four strikerpins.