Features: Specially designed IS-Z50 tripod mount ring, for Z 50mm f/1.2 S lens. It supports only shoot horizontally, not vertically, also can'for t rotate. Tripod ring corners are polished, plastic film inner wall , preventing the lens from being scratches. Plate length is about 50mm, built-in camera quick release plate for tripod for head, equipped with 1/4" and 3/8" screw holes, allows you to fix the lens to the tripod directly. Bottom is 39mm standard RRS interface quick release plate, for RRS / ARCA-SWISS / GROUP / WIMBERLEY MARKINS /SUNWAYFOTO / BENRO tripod ballhead, pan for head and clamp. Made of aviation aluminum material, precision CNC machining, lightweight hollow design, polished and anodized finish on the surface, exquisite workmanship and durable for long service life. Specifications: Material: Aluminum Alloy Color: Black Lens Inner Diameter: about 72mm, width: about 20mm Plate Length: about 50mm/2.16" Applicable Model: for Z 50mm f/1.2 S Lens Package Includes: 1 Piece IS-Z50 Tripod Mount Ring for Z 50mm F1.2 S Lens note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.