●☞ Type: Threading inserts and threading holder set ●☞ Inserts Material : Carbide inserts with CVD Coating. Coating endows inserts strong impact resistance, good versatility with high precision, high finish and high wear resistance. ●☞ Inserts Feature: Wear-resistant and heat-resistant, not easy to stick to the holders or workpieces,Suitable for Stainless steel parts processing. Vacuum hardening, exquisite craftsmanship, easy cutting. ●☞ Holder : Strong steel as material, laser lettering on holder. Anti-rust oil wiped on holders to prevent from oxidation.Plastic box packing ,easier to store. ●☞Package includes: A SER1212H16 threading holder with a T15 wrench