Feature: 1. Compatibility: This tripod mount ring is specifically engineered for Z 28 to 400mm F/4-8 VR lens. It features protective contacting surface to prevent wear on the lens when mounted correctly. 2. Quick Release Plate: The bottom of the lens collar includes a 70mm quick release plate equipped with both 1/4 inch and 3/8 inch screw holes. This makes it highly compatible for Arca tripod heads, panoramic heads, and clamps. 3. Improves Balance And Stability: When mounted on a tripod, this ring helps secure and balance heavy or long lenses in front of your camera. The added stability allows you to catch clearer images, even in challenging conditions. 4. Aluminum Alloy Material: Made from aerospace grade aluminum, this tripod mount ring is CNC precisely machined for enhanced durability. Its robust construction ensures resistant to erosion, making it suitable for various shooting environments. 5. Easy Installation: For optimal installation, ensure that no stickers are on the lens surface before mounting. Any sticker may affect the proper fit and functionality of the ring. Once installed, the mount allows rotating freely similar to the original tripod ring, giving you flexibility during your photography sessions. Specification: Item Type: Lens Collar Tripod Mount Ring Material: Aluminum Alloy. Package List: 1 x Tripod Mount Ring 1 x Spanner