Our most popular flexible phenolic plate set consisting of 3", 4" and 5" plates. Our flexible phenolic backing plates come in a wide variety of sizes to meet your needs from polishing to sanding and grinding. All AES Industries phenolic plates meet rigid technical and performance standards. Made in USA; Molded Depressed Center Hole: 7/8"; Plate Thickness: .055"; 3" Diameter 25,000 RPM Max.; 4" Diameter 25,000 RPM Max.; 5" Diameter 20,000 RPM Max.