User Benefits Application: Sanding wood and regular steel. Floor sanding. Features: Aluminium Oxide grit bonded to cloth backing. Pack of 5. Belt is designed for use with very powerful belt sanders Compatible with: 9401 9403 9404 9924DB: Hitachi Ryobi Material: Wood, Regular Steel. How Do I Know What Grit of Sandpaper I Need The grit you use depends on what job you are trying to do. The lower the grit the rougher the sandpaper and conversely, the higher the grit number the smoother the sandpaper. The table below gives you an idea of what grade you may need for your application. 40-60CoarseHeavy sanding and stripping, roughing up the surface. 80-120MediumSmoothing of the surface, removing smaller imperfections and marks. 150-180FineFinal sanding pass before finishing the wood 220-240Very FineSanding between coats of stain or sealer. 280-320Extra FineRemoving dust spots or marks between finish coats 360-600Super FineFine sanding of the finish to remove some luster or surface blemishes and scratches.