Helps aboult B.Z.E 39 wanted

[Davidliebely]

Hello guys
as we all know,there are four kinds of B.Z.E 39 fuze with red/blue/yellow/grey head, use for the german egg hand grenade .and the blue have a 4.5sek delay time，the red one sek. the yellow 7.5 sek and the grey 10 sek. could anyone tell me why? the 7.5 and 10sek are use for what?
I am very sorry for my poor English.thank guys

 

[Tmine35]

Yellow is for Hafthohlladung ( magnetic AT mine ).

 

[Davidliebely]

Yellow is for Hafthohlladung ( magnetic AT mine ).

thank you
and what is the grey one use for?

 

[Grenademan2005]

The grey ones were used for more or less the same than the yellow ones with Panzerhandmines and for small demolitions.