Yes, you can use 5.5 inch pads on your circular polisher!
For some detailing jobs, the size of a 5.5 inch buffing pad is just right. For those jobs, you need the Flex-Foam HD Rotary Backing Plate. It's made to stand up to the high speeds and demanding jobs of a rotary/ circular polisher.
The Flex-Foam HD Rotary Backing Plate is made of impact-resistant, synthetic nylon bonded to an inch-thick layer of dense foam. The foam construction provides insulation against the heat generated by the polisher plus flexibility. Hook and loop fasteners are bonded to the foam for secure pad attachment.
The Flex-Foam HD Rotary Backing Plate fits all rotary polishers with a 5/8" x 11 thread. Use 5.5 to 6.5 inch pads safely with this backing plate. The soft, recessed edge helps prevent contact with the paint.
Finally, a rotary backing plate for 5.5 inch pads! The Flex-Foam HD Rotary Backing Plate is built to meet all your detailing demands.