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 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 one of the above models, please verify compatibility based on diameter (5 inch), 8 dust holes, 4 screw holes, and center-to-center screw hole distance (1-1/4 inch). Quality Material: These disc sander pads are made of rubber material with smooth surfaces, durable and resistant to cracking, suitable for prolonged and repeated use on flat surface sanding applications. Easy Assembly: Built-in mounting threads allow for quick and easy installation, saving time and effort when replacing the pad. Extend Sander Life: This package includes 2 pieces of 8-hole sander hook and loop pads, providing sufficient quantity for personal use and replacements, effectively helping to maintain consistent sander performance.