Item # SK4555, Sanding & Finishing Backing Pad On Flexovit USA, Inc.
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Amazon.com: Elitexion Angle Grinder Ribbed Back 4-1/2 inches Plastic Pad for Resin Fiber Disc with 5/8 inch 11 Thread, Max 20,000 RPM : Industrial & Scientific
5" X 5/8"-11 Resin Fiber Disc Backing Pad - Benchmark Abrasives