These small and large block sanders are ideal for small and large flat areas respectively. With the nail lock design, regular or PSA sandpaper can be used. When using the adhesive sandpaper, just peel the old stuff off and stick the new stuff on. These will wash up without deterioration of the rubber, which also makes them ideal for wet sanding or color sanding clear coat paint work. Available in a 5” (Small) version and a 9” (Large) version.