You serious? They connect your swaybars to the shocks.
Ahhhh...memories.
My first shot at an endlink and I ended up doing the same thing, looked exactly like that. After replacing an endlink I purchased my air tools, and with a good soaking of PB Blaster, all 4 endlinks came loose in seconds. After hours spent with the hex tool, wrenches, rachets, etc. I said there has got to be an easier way.