TNMG331MR WP35CT aka 4170059 TNMG160408MR WP35CT is a 3/8″ i.c. neutral rake double sided turning insert .015″ corner radius. The WP35CT is used in Steels and stainless steels where toughness is required because of interrupted cuts it is a Tin-TiCn,ALox,Tin coated insert