This is a file for modeling use.
Here's a set of five file sheets--one sheet each of 400, 600, 800, 1000, and 1500 grain--designed for use with your handy Flex File Holder tool (sold separately). Just cut a strip from one of the sheets and thread it as directed on the package. Directions are illustrated and simple, so you can use this device with ease even if you can't read Japanese.
If you don't already have one, you'll want a Flex File Holder, too! Among those we carry are: