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 aerospace-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 with polished edges and corners; inner wall lined with protective plastic film to prevent lens scratching. Plate length is approximately 70 mm, includes built-in camera quick-release plate compatible with tripod heads, equipped with 1/4" and 3/8" threaded screw holes. Bottom features a 39 mm standard RRS-compatible quick-release plate interface, suitable for RRS and ARCA-SWISS tripod ball heads, pan heads, and clamps. Specifications: Material: Aluminum alloy + polycarbonate (PC) Color: Black Plate Length: Approx. 70 mm (2.75"), 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. Color appearance may vary slightly depending on monitor settings. Package Includes: 1 x Lens Tripod Mount Ring Base