Black Hawk 3 inch Zirconia Quick Change Discs are an extremely versatile abrasives. Black Hawk sanding discs are made with the highest quality Zirconia grains and use a threaded male, plastic roll on attachment for fastening. Looking to get into small areas to remove scale oxidation, paints, or waxes? Maybe you're cleaning up a weld, deburring, or just general grinding. Whatever the job Black Hawk 3" Zirconia Quick Change Discs are a great option.