? Self-sharpening, zirconia alumina abrasive with grinding aid provides cooler cut, longer life on hard to grind materials. ? Manufactured with special flexible cloth where the outer 3/8 In. is more flexible than the rest of the disc for use on contoured surfaces. ? All QC cloth discs are designed to run on back-up pads that are rated at or above the RPM of the grinder. ? For applications that require better/decorative finishes, please refer to non-woven quick change discs. ? 24 & 36 grit are recommended for heavy stock removal. ? Ty TP/I fit snap-on/snap-off plastic attachment system. ? Durable, Y-wt., 2-ply polyester backing stands up to demanding applications. ? Tool-free, twist on and off fastening systems make fast work of disc changes to maximize productivity by minimizing downtime.