Item Type: Lens Collar Replacement Foot Material: Aluminum Alloy Interface: 1/4in screw hole, 3/8in screw hole, Arca fit. Product Length: Approx. 13.6cm / 5.35in Product Height: Approx. 3cm / 1.18in Applicable Lens: For NIKKOR Z 800mm f/6.3 VR S For NIKKOR Z 600mm f/4 TC VR S For NIKKOR Z 400mm f/2.8 TC VR S Package List 1 x Lens Collar Replacement Foot 2 x Wrench 4 x Installation Screw 1Good Compatibility: Lens tripod mounting ring compatible with for NIKKOR Z 800mm f/6.3 VR S, for NIKKOR Z 600mm f/4 TC VR S, and for NIKKOR Z 400mm f/2.8 TC VR S lenses. 2Perfect Fitting: Built in Arca fit, 1/4in and 3/8in screw holes, compatible with tripod ball heads, panoramic camera heads, and fixtures. 3Great Stability: The lens mounting base is installed on a tripod, which can help you fix and balance your lens. There are two safety stop screws on both sides of the bottom to prevent the device from accidentally falling off. 4Aluminum Alloy: Made of aluminum alloy material, CNC accuracy machining, manual polishing, surface anodizing treatment, strong durability. 5Light in Weight: Hollow out design makes the lens collar replacement foot lightweight and easy to carry, also very simple to install and remove.