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 Collar Material: Aluminum Alloy Weight: Approx. 261g/9.2oz Mount Type: 1/4 Inch Thread, 3/8 Inch Thread Application: for RF 100 to 500mm f/4.5 7.1L. Package List: 1 x Lens Collar 1 x L Shaped Hex Wrench