Diablo ultra fine dual edge sanding sponge block. Diablo's industry first dual edge sanding sponge blocks are tear resistant against splinters, and nail or screw ends. Diablo's sanding sponge blocks are used for drywall and wood. The dual edge sanding sponge blocks have a chamfered edge for sanding contours and molding and an angled edge for detail and corner sanding. All Diablo sanding sponge blocks have a unique color code to determine grit needed. The color code for ultra fine grit is green.