Features: Upgraded IS-RF100 lens collar support is specially designed for the RF 100mm f/2.8L Macro IS USM lens. Supports horizontal and vertical shooting; when shooting vertically, loosen the knob to rotate the lens for convenient operation. Made of aircraft-grade aluminum, precision CNC machined, lightweight hollow design, with polished and anodized surface finish for durability and long service life. Tripod mounting ring features a split structure; edges and corners are polished, and the inner wall is lined with protective plastic film to prevent lens scratches. Plate length is approximately 70 mm (2.75 in), with built-in camera quick-release plate compatible with tripod heads, featuring both 1/4" and 3/8" screw threads. Bottom features a standard 39 mm RRS-compatible quick-release plate interface, compatible with RRS and Arca-Swiss tripod ballheads, pan heads, and clamps. Specifications: Material: Aluminum alloy + polycarbonate (PC) Color: Black Plate Length: Approx. 70 mm (2.75 in), with 1/4" and 3/8" screw holes Compatible Lens: RF 100mm f/2.8L Macro IS USM Note: Please allow for a measurement tolerance of up to 1 cm due to manual measurement. Screen settings may cause slight color variation between the image and the actual product. Package Includes: 1 x Lens Tripod Mount Ring Base