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 the following: 5 inch diameter, 8 dust holes, 4 screw holes, and 1-1/4 inch center-to-center screw hole distance. Quality Material: These disc sander pads are made of durable rubber material with smooth surfaces, resistant to cracking, suitable for prolonged and repeated use on flat surface sanding applications. Easy Assembly: The built-in mounting design allows for quick and easy installation, saving time and effort when replacing the pad. Extended Sander Life: This package includes 2 pieces of 8-hole hook and loop sander pads, providing a practical quantity for regular use and replacement, helping maintain consistent sander performance.