Features: Specially designed IS-ZMC105 tripod mount ring, for Z MC 105mm F2.8 VR S lens, remains switch function. After installation, it can only support horizontal shooting, not vertical or rotatable. 71mm Inner diameter, 20mm width, plate length is about 50mm, self-equipped with 1/4 and 3/8 screw holes. Standard Arca-Milano for Arca for Swiss, RRS, kirk, Wimberley, Wimberley, Markins, Sunwayfoto, Benro, Fotopro and more ballhead, 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 71mm, width: about 20mm Plate Length: about 50mm/2.16" Applicable Model: for Z MC 105mm F2.8 VR S Package Includes: 1 Piece IS-ZMC105 Tripod Mount Ring 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.