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3D3DZirconium oxide flap disk.
This is a sort of combination grinding wheel/sand paper used to do really rough grinding of welds. The abrasive is zirconium oxide, basically industrial-grade cubic zicronia fake diamonds.
Source: Harbor Freight Tool Company
Contributor: Theodore Gray
Acquired: 11 March, 2009
Text Updated: 12 March, 2009
Price: $8
Size: 5"
Purity: <30%