1This focusing helicoid tube is made of good aluminium alloy, sturdy and durable. 2The length of this helicoid tube is adjustable, it offers a distance for lens focusing adjustment, easy to use. 3This helicoid tube is useful for those lenses without focus ring. 4It can be used as macro barrel and offers fine focus control for macro photography. 5It will be better when you use it with filter adapter together.Features: This focusing helicoid tube is made of good aluminium alloy, sturdy and durable.The length of this helicoid tube is adjustable, it offers a distance for lens focusing adjustment, easy to use.This helicoid tube is useful for those lenses without focus ring.It can be used as macro barrel and offers fine focus control for macro photography.It will be better when you use it with filter adapter together. Specifications: Condition: 100% Brand New Item Type: Telephoto Lens Material: Aluminium Alloy Color: Black Adjusting Length: 25-55mm Size: Approx. 5.8 x 2.9cm / 2.3 x 1.1inch Weight: Approx. 90g Package List: 1 x Focusing Helicoid Adapter