Features: The upgraded IS-RF100 lens collar support is specifically designed for the RF 100mm f/2.8L Macro IS USM lens. It supports both horizontal and vertical shooting. For vertical shooting, loosen the knob to rotate the lens for convenient use. Made from aerospace aluminum material, precision CNC machining, lightweight hollow design, polished and anodized surface finish, durable for a long lifespan. The tripod mount ring has a split structure, with polished edges and corners. The inner wall is lined with a plastic film to protect the lens. The base plate length is approximately 70mm, with a built-in camera quick-release plate for tripod heads, equipped with 1/4" and 3/8" screw holes. The bottom features a 39mm standard RRS interface plate, compatible with RRS/ARCA-SWISS tripod ball heads, panoramic heads, and clamps. Specifications: Material: Aluminum Alloy + PC Color: Black Base plate length: approx. 70 mm/2.75", with 1/4" and 3/8" screw holes Applicable model: for RF 100mm f/2.8L Macro IS USM lens Note: Please allow 0-1 cm error due to manual measurement. Please ensure you don't mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1-piece lens tripod mount ring base