This is a set containing a sanding pad (with 1/4 inch shaft) and 100 sanding discs (50 mm diameter). The sanding discs can be placed on the sanding pad (hook and loop) and used with almost any (electric) machine. This set is suitable for polishing and sanding various materials (wood, metal, stone, etc.) with all kinds of multitools and drills. The sanding paper is not suitable for wet sanding. The discs are provided with hooks and loops so it will be usable with our 50 mm sanding pad. Sanding paper grits: