113.399 | LEISTER 4mm (0.16 in) Round Screw-On Speed Welding Nozzle With Tacking Tip.
Fits directly on the Penweld and Welding Pen models.
This nozzle can work with Triac/Diode with the screw-on "protection tube" and requires the Triac/Diode nozzle adapter 143.833
It can also work with the Hot Jet S/Labor S with adapter 143.831.