This is a Towa Gage box used for setting the bobbin tension on M size bobbins for longarm quilting. The towa gage is not included.
I have had my towa gage for many years. I hope it hasn't changed sizes. This will fit the towa gage snug so it doesn't fall out. You can put your screwdriver in the tool box side with the lid. I made this box because I kept having to search for my screwdriver.