3M Perfect-it III 125mm rotary backing plates are constructed from an impact resistant synthetic nylon plate bonded to a 25mm thick layer of dense cellular foam. For use with M14 threaded rotary polishers such as the 3M, Silverline, Makita, and Kestrel. The highly flexible design allows for very easy transitioning from flat to contoured surfaces, and the hook and loop backing material enables quick and easy pad changes. Perfect for all 240v Machines. Suitable for all our 150mm pads. Professional Grade. Highly flexible design. 25mm foam layer thus reducing buffer hop. High Quality Product.