This one had me stumped until r/whatisthisthing told me to check if the hexagonal part is magnetic. It is, and that means it’s meant to hold a nail and let you start it by giving it one gentle hit. Then you switch to the square side to finish driving the nail.
Location: Box 22
Have you used this tool? Think my description is all wrong? Have a better example? Comment now with any thoughts you have about this tool!