Wimberley AP-652 Replacement Lens Foot Replaces the factory foot of your lens, lowering the center of gravity for optimal balance Adds a built in double dovetail for Arca Swiss compatibility Nikon 600 f/4 AF-S Version I Lenses (Version II uses the AP-452) Anodized 6061 Aluminum, stainless steel fasteners Made in USA. Assembled in Charlottesville, Virginia