These adapters screw right onto most 2 oz and 4 oz airbrush paint bottles (such as Createx, Badger Air Opaques, Golden, etc) and allow you to change colors quickly and work faster while airbrushing. These measure approx. 13/16" inside diameter of the lid and the dip tubes are 4-1/2" long and can be cut to length. Fit MOST MAJOR AIRBRUSH BRANDS such as Badger, Iwata, Paasche and more!