United Abrasives-SAIT 71211 Type 27 Encore Flap Disc, 4-1/2-Inch x 7/8-Inch Z 120X, 10-Pack Long Life Heavy Duty Wheels For High Stock Removal Will Not Contaminate Stainless Steel Also For Use On Carbond Steel Premium Zirconium Abrasive Material Which Provides Long Life And High Stock Removal Resists Loading On Aluminum Out Performs Competitvie Low Density Flap Discs