The term 'sandpaper grade' refers to the level of coarseness of a particular type of sandpaper. COARSE sandpaper is usually used for heavy-duty jobs such as removing paint, rust, or varnish from surfaces. It is also used for shaping wood and metal. The coarseness of the sandpaper is indicated by a number, with higher numbers indicating a finer grade. The term 'COARSE' in this context typically refers to a grade of 80 or higher.