Text copied from TM9-1985-2 German Explosive Ordnance 1953 :

Length: 2 3/8 inches w/det.
Diameter: 5/8 inch O.D.
Material: metal (glass shear pin)

It consists of a spring loaded striker bolt at the top of which is a grooved pressure head.
The bolt is held against the spring by a small glass rod, 0.05 inch in diameter, which passes through a hole in the bolt and by a safety device.
This safety device consists of a small pair of tongs, the turned-in end of which fit into another housing in the bolt and by the retained in position by the small spring cramp. In the base of this igniter is a percussion cap and the short No.8 detonator.
The igniter and detonator assembly are fitted to the H.E. by the thin metal cramp.

In operation it is assumed that the safety tongs are removed by withdrawing the clamp.
Pressure or a blow on the pressure head will then shatter the glass rod and allow the spring to drive the striker on to the percussion cap.

Designed to be used as a push igniter for improvised mines, etc., or as an impact igniter for H.E. charges when used in an assault.