3M sanding disc backing pad has a diameter of 5 in. The hook & loop attachment allows for easy mounting to the tool or pad. To aid in dust control, this product is designed to work with vacuum systems and comes with 44 holes built into the Sanding Disc Backing Pad. The sanding disc backing pad has a width of 1/2 in. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M sanding disc backing pad can be run at a maximum speed of 12000 RPMs.
For best results this can be used in conjunction with a 5″ x 11/16 thick Cool Cutting back up pad: http://www.djpavlica.com/?product=cool-cutting-back-up-pad-5-with-holes