Features: Metal tripod bracket, replacement foot for RF 600mm F/11 IS STM & RF 800mm F/11 IS STM telephoto lenses, supports vertical shooting. Designed with two lower quick-release plates, both are RRS/ARCA-SWISS standard. Made of aviation aluminum, CNC precision machining, hollow weight reduction design, polishing and surface anodizing, beautiful appearance, and fine workmanship. One end of the bottom plate is locked with spring screws, and 1/4 screw holes and 3/8 screw holes are reserved; the other end of the floating plate is reserved for 1/4 screw holes. Quick-release plate is IS-THRF680PRO standard, compatible with RRS/ARCA-SWISS/KIRK/WIMBERLEY/MARKINS/SUNWAYFOTO/KANGRINPOCHE/BENRO/MARSACE/ISHOOT ball heads of Arca 39mm fit. Specifications: Material: Aluminum Alloy Color: Black Size: Approx. 90x38.5x38.5 mm/3.54x1.52x1.52 inches Screw Holes: 1/4 & 3/8 Screw Holes Applicable Model: for RF 600mm F/11 IS STM & RF 800mm F/11 IS STM Telephoto Lens Note: Please allow 0-1cm error due to manual measurement. 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: 1x IS-THRF680PRO Support Base for Lens Collar