text: The tool has a crucial part to creation of the final product. The tool consists of two main functions: 
  # Localized heating 
  # Material flow
  The tool at its most simplest form consist of a shoulder, a small cylinder with a diameter of 50 mm, and a pin, a small threaded cylinder similar to a drill. The tool itself has been modified to reduce displaced volume of the metals as they merged. Recently two new pin geometries have arisen:
  # Flared-Triflute – introducing flutes (large carving vertically on the pin)
  #A-skew – the pin axis being inclined to the axis of the spindle.