Ideal for curved and complicated shapes; Excels on ultra-hard resins like galss-fiber, carbon-fiber and talc filled plastics. Also it can be used on soft metals like aluminum, copper and brass. Space age ceramics make safe deburring possible because of Workfinisher’s unique non-blade like edge. Deburrs hard plastics effortlessly without the fear of cutting your hand or fingers in the process. It is very safe knife. Can be used for surface finishing the plastics molding parts, very small, very confined areas, narrow, cocave area or complex portion.