An Assisted-Opening Knife, also known as a Spring Assisted Knife. These are a variety of folding knives that have a torsion spring built right into the pivot of the internal handle and blade. These knives usually have a thumbstud or an index tab that opens the knife. Once pressure is manually applied it then triggers the spring to flip the blade open. The torsion spring runs along a track in the inner liner and builds up mechanical energy which takes over thus adding speed to the process for urgent use, plus its also makes the knife overall fun to open :)
Check out our big variety of Assisted Opening Knives.