Feature: 1. PROFESSIONAL DESIGN: This lens tripod mount ring is designed for 50‑400mm F/4.5‑6.3 Di III VC VXD super telephoto professional art lens, ensures stable and balanced shooting. 2. EASY TO MOUNT: At the bottom of the lens ring is an 80mm quick release plate with 1/4 inch and 3/8 inch screw holes that is compatible with for Arca tripod ball heads, panoramic heads and clamps. 3. FIXED AND BALANCED: The tripod mounting ring is mounted on the tripod, it helps you to fix and balance weight or long lenses hanging in front of your camera. 4. EXCELLENT WORKMANSHIP: The tripod collar mount ring is made of aircraft grade aluminum alloy material, CNC fine machining, which makes the lens ring more lasting and erosion resistance. 5. CAUTIONS: The contact surface is protected, it will not wear out the lens surface after installing correctly; There should not be any stickers on the lens surface mounting position, if there are, please remove them, otherwise it will affect the normal installation; After installing, it can be rotated freely like the original tripod ring. Specification: Item Type: Tripod Mount Ring Material: Aluminium Alloy Hole Type: 1/4 Inch Thread, 3/8 Inch Thread Applicable Lens: for 50-400mm F/4.5-6.3 Di III VC VXD. Package List: 1 x Tripod Mount Ring1 x L Shaped Hex Wrench