This mini hinge is one inch long, and each leaf is like 3/8 or less inch wide. Perfect for this project. I think on the catalogue it is listed as small box hinges. They are quite thick, so I had to cut a recess on the edge of each plank so the hinge can be inlaid, and the planks can be close together when the cover is closed over the box.
Without real chisels, I had to resort to using a utility knife and carve the recess out. Almost cut the tip off my thumb in the process. I need chisels.