4 Inch Polisher Backing Plate - Metal Arbor 5/8" 11 Thread Rubber Hook, Black ADVcer 4" Rubber Backer Pad, Hook and Loop Backer Disc Holder Backing Plate (Metal Arbor 5/8" 11 Thread) HEAVY DUTY AND DURABLE - Made of 100% premium grade rubber and brass which makes our polishing backing pad heavier than others and better to the heavy-duty works HOOK AND LOOP BOND - Provide strong grab and hold ability while easy and quick to mount or release your wet or dry polishing pads STRONG BRASS 5/8" 11 ARBOR - Universal general arbor size of America, fits most polisher or grinder in the US market as well as your household polishing machine MAXIMUM 5000 RPM - Support max 5000 revolutions per minute of your polisher thanks to the great grip ability. Save more time from your time consuming sanding project WIDE COMPATIBILITY - Perfect match and bond with all kind of 4 inch Hook and Loop backing diamond polishing pads of various polisher or grinder, like compatible with Damo, Makita, Kawaii, Stadea, Hardin and other polishing machine