Feature 1Applications: This tripod mount ring is specially designed for RF 100 to 400mm F5.6 to 8 IS USM lens, weighing approximately 122g, with an inner diameter of around 86mm. 2Aluminum Alloy Material: Made of aviation grade aluminum alloy, CNC precise machined, the tripod mount ring is equipped with built in anti slip pad to protect your lens from scratches. 3Effective Fixation and Balancing: Can be mounted on a tripod to securely fix and balance heavy telephoto lenses or to suspend them from the front of the camera, relieving the weight of the lens from the camera body. 4Extensive Expansion: The bottom of the lens collar features a 70mm quick release plate with 1/4 inch, 3/8 inch screw holes and for Arca port, compatible with tripod ball heads, panoramic heads, and clamps. 5Easy Installation: This camera lens tripod mount ring is easy to install with a large thumb knob that can be loosened or locked to effortlessly release and secure the lens.Item Type: Lens Tripod Mount RingMaterial: Aluminum AlloyWeight: Approx. 206g/7.3ozInner Diameter: Approx. 86mm/3.4in .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Lens Tripod Mount Ring1 x Wrench