These are spindle Mounted Scotchbrite/Fibral Non Woven nylon abrasive material. They have a 6mm spindle suitable for use on a conventional drill.
Coarse - A general purpose 80 grit Nylon abrasive material.
Medium - A general purpose 180 grit Nylon abrasive material.
Fine - A general purpose 240 grit Nylon abrasive material.













