2068-M4 right-angle fast feed milling cutter shank LN11 square shoulder internal coolant cutter shank LNPU110408 milling insertsM4 right angle fast feed milling cutter shank LN11 square shoulder internal coolant cutter shank LNPU110408 milling inserts 1. The tool processing strictly adheres to the process of heat treatment and then tapping, to avoid the deformation problem caused by post heat treatment, the blade and the blade are closely fitted, and the high precision does not bounce the knife 2. 42CrMoTi alloy steel, quenched and hardened, durable, the surface has been