3M Power Sanding Sheets 9012NA， 4.5 in x 11 in， Assorted Grit. This assorted grit aluminum oxide sandpaper is used for general purpose sanding on paint， wood and metal. Use it by hand， on a sanding block， or cut it to size for a power tool sander. Be sure to sand with the grain of the wood and always work through a sequence of grits， from coarse to very fine. Also available in flexible sanding sponges for flat and contoured surfaces like raised panel doors， cabinets or windows. Choose a block sanding sponge or for hard to reach areas， like corners; try one of the angle sanding sponges.