These boxes are made of thick clear acrylic, giving you the ability to see what's inside while not skimping on sturdiness. These are great for display or storage - use them as dump bins with lids for loose items in retail, or keep supply closets organized at the office. The cam lock provides added security, in case your're displaying or storing something you rather not have touched. This version comes with a locking hinged cam lock lid. Lids have a 1/8" front lip overhang. A set of two keys is also provided.