Application:Ideal for removing all kinds of weld marks, paint stains, metal rust and rust spots and for furniture repair, wood carving, automotive sanding, as well as for the manufacturing and construction industries. Design:Easy to install and remove by simply rotating the R-threaded screw on the back into or out of the tray.Used in conjunction with various power tools and pneumatic tools, such as sanding machines and drills for maximum sanding control. High Materials:Aluminum oxide surface is solid and durable, with a uniform grit surface that is heat-resistant and allows for fast as well as high-quality cutting and polishing. Size:50mm/2" Warm Tip: Please don't use it in water because this kind of sandpaper without waterproof function and not suitable for wet sanding. Material: Aluminum oxide. Size: Diameter: 50.8mm / 2". Attention: 1. please keep them away from little kids; 2. If you receive a defective product or have any problems about item, please feel free to contact us, we will help you as soon as possible.