1Selected imported aviation aluminum, adopts high accuracy CNC machining center precision processing. 2Sturdy, stable, wear resistant, surface electroplating baking paint. 3High grade flannelette surface planted internal, will not scratch lens body. 4Suitable for Canon 70& 8209;200mm f2.8L one two three generation other lenses. 5Good workman, reliable connection, ensures safety of the lens when using. Condition: 100% Brand New Item Type: Lens Mount Ring Material: Aluminium Alloy Color: As Pictures Shown Quantity: 1PCS Suitable Lens:For Canon 70-200mm F2.8L USMFor Canon 70-200mm F2.8L IS USM Anti-Shaking For Canon 70-200mm F2.8L IS II USM Anti-Shaking 2 Generation For Canon 70-200mm F2.8L IS III USM Anti-Shaking 3 Generation For Canon 100-400mm F4.5-5.6L 1 Generation(2 Generation Cannot Used) For Canon 300mm F4L ISFor Canon 35-350mm F3.5-5.6L Weight: Approx. 142g Circle Diameter: Approx. 77mm/3.03inch 1 x Lens MountRingThereisaslighterrorinthemanualmeasurement,subjecttothepractice.