Model 43 grenade

Stielhandgranate (lit. "Stick hand grenade") is a series of World War I and World War II–era German hand grenade designs, also known as the Potato masher (German: Kartoffelstampfer), Doorknocker (German: Türklopfer), or Jam-pot and stick grenade (by the British in WWI). The first models were introduced by the Imperial German Army during World War I and the final design was introduced during World War II by the German Wehrmacht.