United Abrasives- SAIT 78241 Ovation Attacker Flap Disc with 4-1/2-Inch Diameter and 7/8-Inch Arbor, 10-Piece Made in the U.S.A. High Premium zirconium grain on a durable polyester cotton backing provides fast cutting action and long life. Will not contaminate stainless steel Ferrous and/or non ferrous metals Stainless steel, high tensile steel and titanium Non ferrous metals aluminum, copper, brass etc