The ends of the Concave / Convex Cabinet Scraper are designed to be used on rounded or hollowed services. The edges for flats. Works like a regular card scraper but is a little harder to sharpen on the ends. Scraping produces a cleaner surface than sanding; it does not clog the pores of the wood with dust, and does not leave a fuzz of torn fibers, as even the finest abrasives will do.