This medium sized stainless steel gravity knife is a rarely seen type of knife that deploys and retracts automatically by the force of gravity. The blade is released by sliding open the hinged handle with your thumb while the blade is pointing downward, and allowing it to drop out. Retraction is the same except the blade points upward as you open the hinged handle. The hinged handle itself is very lightly sprung to keep it closed until needed.
This stainless steel and aluminum gravity knife features a traditional drop point blade and the action is very smooth (and satisfying). Everything really clicks into place nicely.
If you are preparing to parachute into the Normandy countryside preceding an invasion, you might want something larger, but if your needs are more modest, this is an excellent choice.