80-grit discs are the matching item to 80-grit belts on the drum sander. If you had to sand the middles of your floor with 80-grit on the drum, you will most definitely need 80-grit to sand the edges. In the universe of floor sanding grits, 80-grit is usually the finest and last grit used on the floor (except for the edges of maple and fir floors. Click HERE for our thoughts on sanding the perimeters of those floors with 100-grit instead)
The job of the 80-grit paper is to sand out the scratches from the previous grit, 60, so that the wood is effectively scratch-free. This will not leave the wood silky-smooth, nor should it. 80-grit should leave enough texture in the wood so that the finish can bond effectively, but without leaving deeply visible scratch marks.
Mineral: silicon carbide
Bolt-on style disc with 7/8” center hole