1)Backing:fiber disc
2)Abrasive :aluminum oxide OR silicon carbide ORzirconium aluminum.
3)Size: 4" 4.5" 5" 6" 7"
4)coated :close
5)Grit:36#-600#
Used on angle grinder for removing rust, burr, paint and so on. For polishing in machinery repairing and furniture making.