Light and easy to hold, the Perma-Grit® Flat Sanding & Contour Blocks come in 7 standard sizes and are made from anodised aluminium extrusion. A truely flat sander that will not warp, great for straight edges and they will sand a perfect right-angle when placed on their side. A must for scratch & kit builders. Also great for DIY and woodworking.

The Perma-Grit® Sanding Blocks have coarse grit on one side and fine grit on the opposite side. 

The Swop Blocks have interchangeable sanding sheets with Grit from Fine to XXCoarse. The black plastic holder has a felt backing pad and wing nut for attaching the sanding sheet.