Features: brand new and high quality 1. The lens collar is tailor-made based on the lens structure, only for Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD B061 (X Mount and E Mount) lens; support lens rotation and vertical shoot; 2. The tripod collar bottom is added 50mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball for head, panoramic for head and clamp directly; more practical than lens collars without QR-Plate; 3.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, for RRS / ARCA-SWISS / ISHOOT tripod for head clamp 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 lens collar IS-TA1830 can be combined with clamp mount converter IS-3950PRO (Sold Separately), which can be used for fluid heads with Manfrotto structure; 6. The tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish, exquisite workmanship. Specifications: Item: Lens Collar Material: Aluminum Alloy Model: IS TA1830 Color: Black for: for Tamron 18-300mm F3.5-6.3 Di III-A VC VXD B061 X/E Mount Tripod Mount Ring Package Includes: 1 x Lens Tripod Mount Ring Base IS-TA1830 note: (The other items in the photos not listed here are for illustrating only, not included) Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. The error of manual measurement of the size is within the normal range of 0-2cm.