Indexable Carbide Insert - Suitable for engraving all types of materials, such as plastic, non-ferrous metal, aluminum, copper, carbon steel and stainless steel. Full peripherally ground insert to ensure efficient repeatability. It performs excellently without producing any burrs, especially in copper, aluminum and stainless steel. NC2071: Strong edge on chip groove best suited for min. DOC 2mm. Universal grade for all kinds of steel <30HRC and non-ferrous metal and stainless steel. Each insert has 2 cutting edges.