For use with bronchoscopes, lenth:30,26 and 20cm. Telescopes Diameter : 2.8mm. length 30cm advance optical technology, low-loss rod-lens systems and laser welded stainless steel parts for long lasting soakable and autoclavable endoscopes. Integrated fiber optic illumination with light-concentrating fiber cone for optimized illumination of the operating site with fiber optic light transmission.