Spl drawn allow steel is used which gives it high tensile strength, they are tempered in house in a special Waspman furnace for Spain which gives the grain structure of bars uniformity as a result they do not chatter and give a good surface finish. Spare carbide inserts are also available at all times. Do visit our website and have a look on other tools we have for your shop which you might need for your shop. Thanks and have a nice day ahead.