Coarse : 60#--120#
Good for rough sanding and removing layers of old paint quickly, including rough sanding of polyester putty, steel plate, and wood material.
Medium : 120#--600#
Makes a good starting for most projects, feather sanding, grinding of polyester putty, aluminum plates, fiberglass, metal materials, and wall shaping.
Fine : 600#--1200#
Great for fine sanding of polyester putty, paint primer, and old paint, used for fine grinding and fine shaping of furniture, amber, metal, etc.
Extra Fine : 1200#--3000#
Used for light sanding between coats of finish and to sand metal, hardwood, stone, and other non-metallic materials.
Super Fine: 3000#--10000#
Mainly used for mirror polishing of metal, stone, non-ferrous metal, water-based paint, glass, and other objects.