PU material: This sanding pad is made of high-quality, durable PU material. A sanding pad made of this type of material ensures excellent smoothness and polishing of the sanding disc, preventing damage to the user. Easy to use: This 8-hole sanding disc has 3 integrated mounting screw holes and a hook-and-loop design, making installation quick and easy, as well as quick sandpaper changes. Special design: This sanding disc is designed with 8 holes and is compatible with sanders equipped with a dust collection system. This dust collection feature is extremely convenient; the 8 dust collection holes effectively draw dust and debris into the dust bag. Sanding pad size: Our sanding pad has a diameter of 125 mm, with 8 dust holes and 3 screw holes. The dust holes are 11.5 mm in diameter, the screw holes are 4 mm in diameter, and the pad is 11.5 mm thick. Before purchasing, please ensure that our sanding pad is compatible with your sander. Note: These measurements are taken manually; please allow an error of 1-11 cm. Due to differences in lighting and screen settings, there may be some color variation. The actual product received should be considered the definitive version.