I didn't have anything to store my PSA graded cards, so I decided to design this PSA card case, which holds and protects up to 22 cards.

The two pins are there to connect the top and bottom of the box. Each side has a pin counterbore to hold the pin head (see in image 4). I had to use adjustable pliers (with a small cloth to avoid scratching) to permanently fit the pins into their positions.