Good grinding performance for commercial use. Use dust extraction for better processing and improved health. Application: sanding, wood, metal, decoration; Features: aluminum oxide grain bound on durable paper. 8 holes for easy dust extraction. 10pcs Hole: 4+4 Compatible With:9036 BO3700: Bosch, B&D, DeWalt, AEG, Milwaukee, Metabo, Festool, Ryobi Material: Wood and Normal Steel. How do I know which grit of sandpaper I need? The grain you use depends on what task you want to do. The lower the grit, the rougher the sandpaper and vice versa, the higher the grit, the smoother the sandpaper.