It moves the lens farther away from your film or digital sensor， transforming your lens into a macro lens. Features:Includes 3 entension tubes: 13mm， 21mm， 31mm， allowing you to change the focus length according to your needs.It is suitable for Canon EF / EF-S lenses， can transform the lenses into macro lens.Automatic focusing design and support for TTL auto exposure， provides sharp， defined images.Fine copper contact point with excellent conductivity.It does not affect image quality as there is no optics inside.Unique design of dull polish， provides exquisite appearance which looks like a part of your camera.Detachable design， easy for you to install and carry about， perfect for outdoor photography.Specifications:Material: ABS & MetalExtension Length: 13mm; 21mm; 31mmCompatible Camera: for Canon DSLR Camera(such as for CANON EOS 760D 750D 700D 650D 550D Rebel T2i T3i T4i T5i 5D3 5DR 5DRS 70D 7D2 60D 5D2)Item Size: 8.1 * 6.5 * 6.5cm / 3.2 * 2.6 * 2.6inItem Weight: 146g / 5.2ozPackage Size: 9.5 * 7.1 * 7.1cm / 3.7 *3.0 * 3.0inPackage Weight: 188g / 6.6ozPackage List: 1 * 13mm Tube Extension1 * 21mm Tube Extension1 * 31mm Tube extension2 * Lens Cap