Feature:1. Application: This camera tripod mount ring is suitable for RF 100 to 500mm f/4.5 7.1L art lens, tailored for optimal compatibility with this specific lens model.2. Versatile Compatibility: The bottom of the lens collar features an 80mm quick release plate with 1/4 inch and 3/8 inch threads, allowing seamless attachment for Arca tripod heads and clamps.3. Stabilize Heavy or Long Lenses: The tripod collar mount ring is essential for securing and balancing heavy or long lenses attached in front of the camera.4. Durable Aerospace Grade Aluminum Alloy Construction: CNC precise machining ensures the lens collar is robust, erosion resistant, and able to withstand rigorous use.5. Protective Contact Surface: With a protective surface, this lens collar prevents wear on the lens surface when correctly installed and allows for smoothly rotation like a standard tripod collar. There should not be any stickers on the surface of the lens mounting location, if there is, please remove them, otherwise it will affect the normal installation.Specification:Item Type: Lens CollarMaterial: Aluminum AlloyWeight: Approx. 261g/9.2ozMount Type: 1/4 Inch Thread, 3/8 Inch ThreadApplication: for RF 100 to 500mm f/4.5 7.1L.Package List:1 x Lens Collar1 x L Shaped Hex Wrench