If you bought a bare Dewalt oscillating tool, you may want to add this to your tool bag. This is the box that would’ve come with the full kit to store all the lopsided blades that wouldn’t fit very well in a regular bit case. It is about the size of a index card case (if you still keep addresses on a Rolodex) but has weird channels on the bottom where the blades can be nested into. You can fit A LOT of the oscillating attachments in the box if you pack them vertically in the correct position. There’s a video on YouTube where a lady packs like 25 attachments in the box. You really can’t use it for anything else unless you cut those channels away. I’ve cut out the channels on one box to store a door knob and hinge drilling kit. It’s still a tight fit but now I won’t lose any parts and rip up the inside of my nylon bag.