Based on this product's specifications, here are some alternatives and similar models
Nozzle Steinel 5 mm for Professional heat gun, model 110038668
Summary description:
Steinel replacement nozzle 110038668 with a 5 mm opening designed for use with Steinel professional heat guns. This metal nozzle directs concentrated hot air for precise tasks such as shrink tubing, soldering small components, paint removal in tight areas, and targeted heating. Easy to mount, it improves control and efficiency for workshop and repair applications.