Mountable storage boxes

This is a storage box that is 8cm by 8.5cm and is 6cm deep. For those that like inches that's 3 1/8th by 3 ¼ by 2 3/8 inches. There are a million other storage boxes on the site so why did I build this?Most storage boxes are either small of flimsy. I wanted something that could hold screws, bolts and nailsStackable boxes aren't actually that convenient to use. If you have a large stack of boxes then getting the bottom box can be a hassleI wanted something that could be stacked on the vertical supports of my 3d printing shelfThese boxes have a couple of big differences:they're big enough to hold a good amount of stuff. I can easily put a box of 200 70mm by 5mm screws in one boxthey're sturdy enough to hold the weight when fully filled with metal (bolts, screws, nuts, etc)I can have a big vertical stack of them and I can just slide of the box I want from anywhere in the stack without risking knocking down the stack and spilling their contentsThey're not going to get d