Sanding bit, disc, corundum, 120/150 grit, 18mm, 20 pcs

These are adhesive backed sanding discs made from corundum (Not to be confused with Carborundum). The abrasive compounds are fastened onto a tough base with two different grits available.  

The rotational speed should be adjusted for the material being worked; high speed for steels, medium speed for woods, and low speed for plastics.

These are suitable for working and polishing malleable cast iron, grey cast iron, high quality steels, non-ferrous metals, woods and plastics.