This is a DuraSand Coarse/Medium Sanding Block. Professionals of all kinds have found a wide variety of uses for these sanding blocks. They can be used dry or with water and if they get dirty you can bang the block on your hand or your workbench and knock the particles out. If it gets to the point where you think the block is clogged beyond further use, head to the sink and wash it out for almost new performance! This allows you to get the most out of your dollar!
NOTE: The grits are standard rated, however because they are on foam, when pressure is applied the particles of grain condense and the grit size may feel less coarse than it is rated. For example this sanding block says it is a coarse/medium. This means the grit is 36 for Coarse and 60 for medium; but because the grit is applied to the foam the coarse grit works more like 100 grit and the medium is between 120 & 150.
Size: 2-3/4 x 3-7/8 x 1"