NSN NLF-250 Lens Replacement Foot for Nikon Super-Telephoto Lenses The NLF-250 fits Nikon AF-S NIKKOR 300mm f/2.8G ED VR II and AF-S NIKKOR 200-400mm f/4G ED VR II and AF-S NIKKOR 500mm f/4G ED VR II. Arca-swiss compatible Lightweight Precision design Made of super strong 6060 aluminum