Threaded stainless steel shank for pole spears. One end has 3/8" threads for the pole spear and the other end 6mm standard speartip threads for the speartip. 3-1/4" long.
Some pole spears use 5/16" threads, and others use 3/8" threads. Make sure to check which works with your pole spear.
5/8" Shank also available Here