1. V Groove – Suitable for wire that is solid wire such as steel wire and stainless steel wire roller will feed wire continuously and consistently.
2. U Groove – Suitable for aluminum wire Because aluminum wire is soft This results in the need to use a U-groove roller through which the aluminum wire can feed continuously.
3. K Groove – Suitable for flux cored roller wire. The K groove has a wavy appearance. It will not cause the wire to become deformed and the flux to break, resulting in the ability to feed the wire continuously. There is no tripping of the wire.