iShoot Lens Collar Tripod Mount Ring IS-RF150, Compatible with Canon RF 100-500mm f/4.5-7.1L IS USM Lens Bottom is 39mm ARCA Fit Quick Release Plate Feature, Compatible with Tripod Head & Clamp of RRS / ARCA-SWISS Fit Main Features: 1. The original structure and design of F (WIII) are adopted, and the function of quick release plate is added at the bottom; the inner wall of the tripod ring bracket is a concave-convex irregular structure, which is closely integrated with the lens; 2. The contact surface is plastic composite film, will not wear lens surface when installed correctly; there should be no stickers on the lens surface installation position, if there is, remove it, otherwise it will affect the normal installation; after installation, it can be freely rotated like the original tripod ring; 3. The tripod collar bottom is added 60mm 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; also 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 / ISHOOT tripod 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 tripod ring is made of Aviation Aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish. The appearance and exquisite workmanship are much better than similar products made by mold. Package Includes: 1 x iShoot Tripod Mount Ring IS-RF150 Compatible with Canon RF 100-500mm f/4.5-7.1L IS USM Lens (Note: The other items in the photos not listed here are for illustrating only, not included)