Yocan UNI Pro fit any industry standard-sized 510-threaded cartridge up to an extra-wide 14mm. It fit all 510 threaded cartridges, both refillable and pre-filled, 0.3g oil cartridge, 0.5 vape cartridge and 1.0 hemp cartridges. This Yocan device was made to accommodate a wide range of cartridges.