This is a single gooseneck fiber optic attachment for microscope fiber optic illuminators. It comes with a 22" (560mm) metal-sheathed light cable and a two-step, 5/8" and 25/32" (16mm and 20mm, in diameter), adaptive plug for connecting to a light source. It is brand new in box. Its retail value is above $350. Features & Specifications: A Fiber Optic Single Gooseneck Attachment for 150 Watt Fiber Optic Illuminator Providing Even, Bright and Cool Illumination 22" (560mm) Long Light Cable 5/8" and 25/32" (16mm/20mm in diameter) Two-Step Adaptive Plug Durable Metal Construction Manufactured under ISO 9001 Standards