Universal Tool Air Pencil Grinders feature a double front spindle bearing for increased durability and reduced vibration and a roll throttle and small diameter grip for constant speed and operator control. Universal Tool Air Pencil Grinders are also supplied complete with coaxial hose assembly and a rear exhaust that keeps the work area clean from cuttings. Universal Tool Air Pencil Grinders are best suited for precision grinding in mold and die maintenance.Universal Tool Air Nibblers feature a 16 gauge cutting capacity, and a heavy duty steel anvil with a 5mm punch that adds stability when cutting thicker materials. Universal Tool Air Nibblers also feature a composite comfort grip and a minimum cut radius of 3/16” for detail work. Universal Tool Air Nibblers are best suited for detailed cutting of sheet metal.