Features:This item is a 0.5x C-mount adapter to connect CCD camera or digital eyepiece to microscope.This item has two adapters: 23.2 turn to 30mm and 23.2 turn to 30.5mm.Effects: compact with the lens tube, so that the depth of insertion can be easily controlled.Lens blue anti-reflective coating, increase transmittance.It can be used in all eyepiece position with 23.2mm or 30mm or 30.5mm, 0.5x magnification to get a more wide of view.Specification:Material: MetalWeight: 142g/5ozColor: BlackModel: kp-05xInterface: C-mountInterface Size: 23.2 turn 30mm; 23.2mm turn 30.5mm (as pictures shown)Package List:1 x 0.5X C-Mount Lens Adapter1 x Ring Adapter 30mm1 x Ring Adapter 30.5mmNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard..