WNMG-331 TiN Coated Carbide Insert ~ ISO insert number is WNMG060404. ~ I.C. is 3/8″. ~ S is 3/16″. ~ d is 0.15″. ~ r is .0157″. ~ 0 degree relief angle. ~ For turning and milling carbon and alloy steeels, tool steel and stainless steel. ~ Higher heat and wear resistance than uncoated grades.