These hook & loop sanding discs are for use with orbital sanders. Ideal for the majority of sanding requirements on a project. They are 115mm in diameter with 8 pre-punched vent holes. For use on wood, paint, fillers, etc. Available in 60 Grit (Coarse), 80 Grit (Medium) and 240 Grit (Extra Fine), simply make your choice from the drop down menu. Each purchase gives you TWO discs (40 grit), TWO discs (80 grit) TWO discs (120 grit), TWO discs (180 grit) and TWO discs (240 grit). For use on wood, metal, paint, fillers, etc.