Thin ruler with template that can be clipped to notebook, diary, schedule planner. It serves three functions, bookmarker, ruler, and template. Extremely thin at 0.3 mm, so it does not get in the way when turning pages or writing. In addition to being used as an index by clipping it to a page, it also comes with a convenient template. Guide slits that allow straight lines to be drawn at equal intervals are useful for adding ruled lines of the same length!