This box is approximately 6" x 3-1/2" x 3-1/2" with the box height just over 3". The file comes with the box base, the bow base, and the bow detail piece and the bows overlap each other to lock the top! This box is compatible with both the 8x12 and 12x12 mats. You can find additional images and a full tutorial on my blog:  http://jamielanedesigns.blogspot.com/2013/12/top-locking-bow-boxes.html