Our hardy utility boxes are a handy way to store your flies, lures, beads, various materials, or nuts and bolts. I use a bunch of them in my shop. You can use them for a ton of things. They are made of a sturdy Polypropylene and are semi clear. The 2 series as well as the 3 and 3 series all have external hinges that allow you to pop on and off the lid. The first number indicates the overall size and the - # indicates the compartments.