●☞ About DCMT21.51/DCMT070204 inserts (55° diamond): carbide with CVD coating ,used for stainless steel and steel parts.Coating endows inserts strong impact resistance, good versatility with high precision, high finish and high wear resistance. ●☞ About the Turning holders: 40Cr material with forging process , strong and durable ,total length :100mm/3.93", 93 degree turning holder. ●☞ Advantage: Wear-resistant and heat-resistant, not easy to stick to the holders or workpieces or break up.Vacuum hardening, exquisite craftsmanship, easy cutting. ●☞ Feature: Suitable for turning and finishing on a wide range of materials. 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: SDJCR0808H07 + SDJCL0808H07 + SDNCN0808H07 + 10PCS DCMT21.51 Gold carbide Turning Inserts with 3pcs T8 wrenches.