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 For Nikon Z 70-200 f/2.8, 100-400 f/4.5-5.6 and 400 f/4.5 VR S-line Lenses Anodized 6061 Aluminum, stainless steel fasteners Made in USA. Assembled in Charlottesville, Virginia About the AP-501 Replacement Lens Foot The AP-501 replaces the stock foot on Sony Lenses (See list below, Image of compatibility chart, or our site). The AP-501 is precision machined to slide right into an Arca-Swiss style quick-release clamp. It also has 1/4" and 3/8" tapped holes for mounting to non-quick-release tripod heads and monopods. All replacement feet feature the same dual safety stops and flash bracket compatibility as our lens plates. For use on the following Lenses Nikon 70-200 f/2.8 Z VR S-line, 100-400 f/4.5-5.6 Z VR S-line, 400 f/4.5 Z VR S-line Lenses Includes AP-501 Arca-Swiss Style replacement lens foot (Qty 1) Mounting Screw – ¼-20 x 9/16L Flat Head Socket Cap Screw (Qty 1) Safety Stop Screws - M3 x 6mm Socket Head Cap Screw (Qty 2) Hex Key – 5/32 (Qty 1)Hex Key – 2.5mm (Qty 1) Not compatible with most Manfrotto or Gitzo clamps