We CNC inserts are divided into tungsten long inserts positive-angle inserts and negative-angle inserts. A positive-angle insert means that the insert has a back parting tool Inserts angle, which carbide insert canada Tungsten Carbide Inserts THREADING INSERTS boring inserts is a common VNMG Insert single-sided insert. Negative Cutting Inserts angle insert means that DNMG Insert the Cemented Carbide Inserts insert does not have a back angle and both sides of the insert can be used.