1. The tripod mount ring is tailor-made for Nikon Nikkor Z Mount 24-200mm f/4-6.3 VR and Nikon Nikkor Z Mount DX 50-250mm f/4.5-6.3 VR, can't be used for other lenses?the inner diameter is about 70mm, the width is about 18mm, and the net weight is about 130g; | 2. The lens collar is integrally formed, the inner wall is designed with grooves and mounting positions according to the shape of the lens, and 3M plastic protective film is attached, which cannot be rotated, the locking knob is non-slip design; | 3. The tripod collar bottom is added 52mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate. The Lens support bottom reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly; | 4. This lens support bottom's dovetail groove is 39mm Arca-Swiss standard, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for iShoot IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK; | 5. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The tripod collar using laser scanning technology to accurately obtain lens parameters, and then accurately carve out the shape of the inner diameter of the tripod ring according to the dataThe appearance and exquisite workmanship are much better than similar products made by mold.