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 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. Specifications: Material: Aluminium-Alloy Size:As Picture Shown Color: Black Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Microscope Adapter