Universal replacement pad: the 5 inch hook and loop replacement pad is characterized by 4 screw holes and 8 dust holes, fits most sander backing pad, the distance between center to center of the pad’s screw holes is approx.1 to 1/4 inch, please confirm the size before purchase Fits for sander with 4 screws: compatible with Milwaukee 51-36-7090, 51-36-7100, 6021-21, 6034-21 and Ridgid R2600 and R2601 random orbit sander; If your sander is not of the above brand or model, please check if it is suitable for your sander based on these information, 5 inch diameter, 8 dust holes and 4 screw holes, especially the distance between screw holes center to center (1-1/4 inches) Quality material: these disc sander pads are made from rubber 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 help you to save your time and effort to replace it