Use an air pencil grinder from Grainger on any type of material to help smooth out or finish workpieces. Air pencil grinders can help deburr parts, smooth and finish molds, blend contours, grind inside diameters of holes and more. Choose from single- and variable-speed grinders that can operate at free speeds ranging from 25,000 to 100,000 rpms. Shop Grainger today for a high-quality air pencil grinder that can meet your needs.