Roll Turning is characterised by difficult machining conditions wherein, cutting is required to be carried out in rolls both fresh & reworked. The requirement of the cutting cutting edge is to retain its sharpness over an extended period. It is also required to retain the toughness of the insert so that there is no failure of the tool on account of turning large roll diameters. Today m/s Sumitomo has developed a wide range of inserts suitable for this application.