The Cluthe 675 was designed to set small nails in balsa wood -- specifically decks of model ships. Also known as a "Brad Pusher." Never heard of a brad pusher? Check out this video for info on how to use it.
Other uses are possible, e.g. this online user who said, "I'm a teacher and really love this tool to hang poster and such on the walls (drywall). I use tiny size 8 - 12mm sequin pins." Some people also find it useful for beehive frame assembly.
If you borrow this tool, we'd love to know what you use it for!