Feature:1. [Adjustable Focus] Focusing helicoid adapter supports a 0.4 to 0.6in focusing range and provides a 0.2in adjustable focus distance for lens focusing. Easy to adjust, does not deviate from the axes.2. [Upgrade Parts] Focus helicoid ring is the best option for zooming in or changing the lens. Provides a focusing system for lenses that do not have a focusing system, or as a macro focus mount.3. [Anti Reflection] The inner wall of the focusing helicoid adapter is painted and matte treatment, so as not to reflect light on the CMOS and affect the imaging. Enhance your shooting experience.4. [Prevent Falling] Focusing tube adapter can be tightly connected with the lens, and the high strength screws penetrate deep into the ring body and are not easy to fall off.5. [Alloy Material] Macro lens ring is made of high quality aluminum alloy material, which is not easy to wear out, and is black anodized for longer service life and comfortable hand feeling.Specification:Item Type: Focusing Helicoid AdapterMaterial: Aluminum AlloySupports 1015mm/0.40.6in Focus Range.Package List:1 x Focusing Helicoid Adapter