Those nozzles are ideal for high detail and non-planar printingsmooth stainless steel tip used in airbrush on a brass adapter with M6 thread that makes it compatible with most hotends.Tip is removable, and can be swapped with different diameter one, allowing 'nozzle change' without risking damaging thermistor or heater cartrigedistance from tip to flange (bottom of heaterblock) : 9.5mm