Description of Prime Line 9187280 Slotted Spring 25 Pack
Size: 1/16 inch X 1/2 inch. Inserts through holes of two or more objects to hold them together. Slot along length of pin allows it to compress during insertion into hole. Tension force exerted against the walls of the hole secures the pin into place. Commonly called roll pins or "C" pins.
I have a door between my house and garage that swings open into the garage so the hinged door is open to anyone who ever enters my garage, she can't open, pull out the hinge pin after inserting the hinge pin into each hinge leaf.