HHIP Tin Coated C5 triangle positive rake carbide insert for turning and milling carbon and alloy steels, tool steel and stainless steel. Single sided for semi-finishing. 7 degree relief angle. Triangle with chip breaker. ISO insert number is TCMT220404. I.C. is 1/2. L is 7/8. S is 3/16. d is 0.22. r is .0157. Provides a longer life than uncoated grades. Works well in high heat situations and offers wear resistance on alloys, stainless steel and ductile iron.