I bought three sets, but there are variations in the finish of the case. There are things that are hard and hard to open, and there are things where nails are not caught firmly. There is no problem with using it in the flat place, but the contents comes out when it gets on the scene by loading it in the car in a standing state. (Only those with weak nails). Since it can not be helped, I collect bad boxes that I can not make for one set and use it for company storage. It is easy to use in total and has durability in total. Since the contour of the frame is refreshing and there are no strange protrusions, it is easy to put in and out without getting caught on the car.