CGW Abrasive Conical ZA Flap Disc is made of excellent carbon and stainless steel. CGW 4 1/2 XL 29 Conical ZA flap disc offers high stock removal and extended service life. Disc having an arbor size of 7/8 and grit size of 40 is tough and aggressive for a low noise no vibration action. • Diameter: 4 1/2-inch. • Thickness: XL. • Backing material: Polyester/Cotton. • Abrasive material: Z3 -100% zirconia alumina. • Grit/Grade: 40 (medium). • Active grinding agent provides cool cutting with light pressure special optimized resin bond offers maximum cutting capacity strong edge stability and long life. • Premium zirconia alumina grain with a poly/cotton heat-treated backing. The poly/cotton combination provides low stretch and strength for the high zirconia concentration that Z3 contains and enables fast grain removal for carbon based steels (26% more than the competition) offering excellent life. • Applications: Deburring deflashing rust removal snagging; Used with right angle grinder/sander; Applicable materials: Ferrous and non-ferrous metals stainless steel high tensile alloys woods plastics. • Contamination-free; Used for contoured and edge work flaps are angled at 8° for greater surface contact and aggressive use best used at 15°-25° angle. • Made in USA. • Premium zirconia alumina grain with a poly/cotton heat treated backing provides low stretch and strength while offering excellent life. • Excellent on carbon and stainless steel. • Deburring deflashing rust removal snagging. • Non-ferrous metals woods plastics. • Used with right angle grinder/sander. • Contaminate-free for working on contoured and edge work flaps are angled at 8 deg for greater surface contact and aggressive use best used at 15 deg – 25 deg angle. • Recommended for aggressive use and heavy duty applications. • Sold as 1 Each.