3M Performance Sandpaper, 03078, 3-2/3 in x 9 in, 320 grit Five sheets of 320 grit sandpaper designed to be used with the 3M Large Sanding Block, 03148 These coarse 3 2/3" inch by 9" inch papers can be used stripping paint to metal, featheredging around the repair area, as well as shaping and sanding body filler. Use during Stage 1 and 3 of the 3M Body Repair System. The abrasive is a long-lasting tough mineral, resists loading. Designed to be used with 3M Large Sanding Block (03149)