Block sanding sheets are designed to be used with Mirka's 3 x 5 In. (81 x 133 mm) sanding tools. These abrasives are ideal for sanding small defects by machine to quickly level the surface to match the surrounding profile. When used with a dust extractor or the Mirka MR-35SGV self-generating vacuum sander, conventional 8-hole paper reduces dust and net sheets offer almost totally dust-free finishing.