Detonator No.8 was the most widely used in the German Army in WW2.
Normally made of aluminium, they were also made in steel, brass and zinc.
They fit about every grenade- and boobytrap-fuze.

Length: 45mm
Diameter: 7mm

Several manufacturers made these detonators, indicated by a single letter on the base of the tube :

j : Gebr. Langer, Schrauben-, Metallwaren- und Federnfabrik, Chemnitz 9
l : (an "L", not an "i") Lignose Sprengstoff GmbH
m : Gesellschaft zur Verwertung chemischer Erzeugnisse m.b.H., Werk Malchow
r : Westfalische Anhaltische Sprengstoff A.-G., vorm. Alfred Nobel & Co., Werk Reinsdorf
s : Dynamit A.-G., vormals Alfred Nobel & Co., Werk St.-Lambrecht
t : Dynamit A.-G., vormals Alfred Nobel & Co., Werk Troisdorf
w : Gesellschaft zur Verwertung chemischer Erzeugnisse m.b.H., Werk Wolfratshausen

The middle photo above show unmarked detonators.

Detonators were packed in a drilled wooden block, wrapped in weatherproofed paper with a label referring to content, lot code and control stamp.

Information thanks to Tom.
All photos © Miguel A.J.

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On the right , the box of detonators that I have in my collection.
One place in the box stays empty.
The thin wooden cover is missing.

The detonator laying in front of the packing is a Sprenkapsel No8 made of zinc.