1. The lens collar is tailor-made based on the shape and structure of the lens, only compatible with Canon RF 100-400mm f/5.6-8 IS USM Lens, cannot be used with other lens; the inner wall of the tripod ring has a concave-convex irregular structure, and the switch hole is reserved, which does not affect the use of the switch on the lens; the tripod ring cannot be rotated, only support horizontal shooting; 2. The contact surface between the inner wall of the tripod ring and the lens 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; hollow-out weight reduction design, net weight is about 160g; 3. The tripod collar bottom is added 50mm 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. 4. The Lens support bottom reserved 1/4" and 3/8" screw holes and stainless-steel anti-slip screws for fixing lens to tripod directly. 5. The lens collar IS-RF140 can be combined with clamp mount converter IS-3950PRO (Sold Separately), which can be used for fluid heads with Manfrotto structure. strong iShoot Lens Collar Tripod Mount Ring IS-RF140, Compatible with Canon RF 100-400mm f/5.6-8 IS USM br Bottom is 39mm ARCA Fit Quick Release Plate Feature, Compatible with RRS / ARCA-SWISS Fit Tripod Head & Clamp /strong br br strong Main Features: /strong br 1. The lens collar is tailor-made based on the shape and structure of the lens, only compatible with Canon RF 100-400mm f/5.6-8 IS USM Lens, cannot be used with other lens; the inner wall of the tripod ring has a concave-convex irregular structure, and the switch hole is reserved, which does not affect the use of the switch on the lens; the tripod ring cannot be rotated, only support horizontal shooting; br br 2. The contact surface between the inner wall of the tripod ring and the lens 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; hollow-out weight reduction design, net weight is about 160g; br br 3. The tripod collar bottom is added 50mm 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. br br strong Compatible with: /strong br Canon RF 100-400mm f/5.6-8 IS USM Lens br Can't be used for other lenses br br strong Package Includes: /strong br 1 x iShoot Tripod Mount Ring IS-RF140 Compatible with Canon RF 100-400mm f/5.6-8 IS USM Lens br (Note: The other items in the photos not listed here are for illustrating only, not included)