ID card Holder (expandable)

This is a wall mount ID card holder. It is infinitely expandable by super-gluing the sections together. It is designed so with cards stacked, you can see the persons photo on the cards. The mounting holes are designed to clear a standard wood screw head.
I Hold ID cards of people in exchange for borrowing tools, or using machines. This significantly reduces missing/mis-placed tools, or poor cleanup in an educational/work environment. You don't clean up, you don't get your ID back!