3M Pro-Pak Garnet Sanding Sheets 99416NA, 9 inch x 11 inch, 80D grit. 3M sandpaper comes in a variety of minerals and a wide grit range. Garnet is a natural mineral that fractures during use to form new cutting edges, making it a good choice in woodworking projects. The 9 inch x 11 inch sheets can be used by hand or cut to fit on a sanding block or a power tool sander. Sanding is an integral step in preparing a surface to receive a coating. For the best sanding results, sand with the grain of the wood and work through a sequence of grits, from coarse to very fine.