With this E3D brass nozzle with a diameter of 0.25mm (yellow) for 1.75mm filament from the E3D RapidChange Revo system, you can quickly and easily adjust your nozzle diameter at room temperature. You can change them without using additional tools.
The E3D Revo nozzle has its own heatbreak. This means that it is not necessary to tighten the nozzle at a high temperature. Because each Revo nozzle diameter has its own colour, you can quickly see which nozzle diameter you have in the hotend.