Universal Replacement Pad: The 5 inch hook and loop replacement pad features 4 screw holes and 8 dust holes, fits most sander backing pads, the distance between the pad screw hole center and center is about 1-1/4 inch, please confirm size before purchase Suitable for 4-screw sander: compatible with Milwaukee random orbital sanders 51-36-7090, 51-36-7100, 6021-21, 6034-21 and Ridgid R2600 and R2601; If your sander is not the above brand or model, please check if it fits your sander based on this information, 5 inch diameter, 8 dust holes and 4 screw holes, especially the distance between screw holes center to center (1- 1/4 inch) Quality material: these disc sander pads are made of rubber material with smooth surfaces, not easy to break, which can be applied for a long time and many times, work well on sanding flat surfaces Easy Assembly: The built-in mounting thread allows you to install the sander replacement pad easily and quickly, which save your time and effort to replace it Extend the life of the sander: you will get 2 pieces of 8-hole sander hook and loop pads in the package, one sufficient quantity for your personal use and replacement, prolo Effectively reducing the life of the sander