1、Vacuum Hole: The built in vacuum hole of the sanding tray is uniquely designed, and the dust free work is more efficient and healthier. 2、With Buffer Layer: The white soft rubber buffer layer in the middle of the sanding tray can be used for arc grinding and polishing. 3、Hook and Loop Plate: The hook and loop disc at the bottom of the sanding disc can be glued with flocked sandpaper, water abrasive discs or self adhesive wool balls. 4、Easy to Use: The polishing disc is easy to install and easy to use, which can greatly improve your work efficiency. 5、Wide Application: The matching disk thread can screw the grinding disk on the grinding machine and dry grinding machine, which can be widely used for grinding and polishing automobiles, furniture, hardware products, etc.