Product code: Pearl Abrasive MAX4540ZT 4-1/2" by top 7/8" 40 grit Maxidisc, Flap Discs
From the Manufacturer
4-1/2 x 7/8
Radial Flap Disc Zirconia for Ferrous Metals, Iron, Steel top and Stainless Steel
100% Zirconia grain is extremely tough and sharp: provides high stock removal, cool running, and long life