Inserts with a positive basic shape and sharp edges should always be used. Use the AL-geometry. GC1115 is a high wear resistance, recommended for roughing. H10 is uncoated and is the first choice grade in most cases, from roughing to finishing. For finishing under stable conditions, the polycrystalline diamond (PCD) tipped insert grade CD10 is recommended. CD10 withstands built-up edge better than carbide grades. It provides a good surface finish and also a longer tool life.