This F10A (white) grenade fuze has a delay of 1,5 seconds.
It's fitted with a black powder "inflammator" from SAE ALSETEX.
Used to initiate all the recent tear gas grenades like GLI, CM3, 4 & 6, GM2L, G1 (ALSETEX) or PLMP 7B (Nobel sport) and some flash-bang types (ALSETEX).
The F10A exists also in brown plastic (delay 2,5 sec) to initiate the coloured smoke grenades "F5 type"
A second brown plastic fuze type is the F14A (2,5 sec) for the same smoke grenades but with a non-ejectable lever (supposed for aircrafts ground wind signaling and protection of inlets of motors and helicopters turbines).