FlexOVit® 5" X 7/8" 36 Grit FLEXON® Zirconia Alumina Resin Fiber Disc is constructed of high quality zirconia grain, strong resin bonds and heavy duty fiber backing providing premium performance - long life, fast, cool and efficient material removal. This durable disc withstands tearing glazing and loading on the toughest finishing applications . Premium zirconia grain delivers the longest life on high tensile alloys including metal and stainless steel. Resin fiber discs are used for weld preparation or for blending and finishing applications. Requires use of a back up pad.