The No. 34 was egg-shaped and made of cast iron.
It had a lead filling plug on the side.
The brass fuze had to be struck to a hard surface to ignite the 4seconds delay.
After removing the safety, it had a shear wire which functioned as a second safety.
Heigth 100mm, width 42mm.
Left drawing shows the Mk1, the right one is an Mk3.