Universal Replacement Pad: The 4.7 inch replacement pad with velcro fastening is designed with 4 screw holes and 8 dust holes, fits most sanding pad backing pads, the distance between the center and the center of the pad screw holes is about 1-1/4 inch, please confirm the size before purchasing Suitable for 4 Screw Sanders: If your sander is not the above brand or model, please check if it is suitable for your sander according to this information, 4.7 inches in diameter, 8 dust holes and 4 screw holes, especially the distance between the screws. Center to Center Holes (1-1/4 inch) Quality Material: These disc sanding pads are made of rubber with smooth surfaces, not easy to break, can be applied for a long time and multiple times. Works well on flat sanding surfaces. Easy Installation: Built-in mounting thread allows you to install the sander replacement pad easily and quickly, saving you time and effort for replacement. Extend Sander Life: You will get 2pcs 8 hole sander velcro pads