tungsten carbide indexable inserts include thousands of type, each type have special meaning. The following picture explained the meaning of the indexable inserts. Such as the “T” means the shape of insert is triangle, “N” means the clearance angle of main cutting edge is “0” degree,. “M” means the allowed tolerances is in middle level, “G” means the chipbreaker and clamping system is with double side. And the follwoing include other kinds meaning, if you have any questions, welcome to contact us. We will explain one by one with you.