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 to center is about 1-1/4 inch; please confirm size before purchase. Suitable for 4-screw sanders: 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 one of the above models, please verify compatibility based on diameter (5 inches), 8 dust holes, 4 screw holes, and screw hole spacing (1-1/4 inch center to center). Quality material: these disc sander pads are made of durable rubber with smooth surfaces, resistant to cracking, suitable for extended and repeated use on flat surfaces. Easy assembly: the built-in mounting thread allows quick and secure installation, saving time and effort during replacement. Extend sander life: this package includes 2 pieces of 8-hole hook and loop sander pads, providing a sufficient quantity for personal use and future replacements, helping maintain consistent performance.