1Made of aircraft-grade aluminum alloy, CNC precision machining, polishing, and surface anodizing treatment. 2 Comes with non-slip rubber and 1/4 inch screws and springs. 3Refer to the original structural design and add finger positions and quick release plate functions. The 4-pod ring quick-release plate adopts ASRRS standard/ARCA-SWISS and other pan/tilt heads. 5. Standard 1/4-inch screw holes are reserved at the bottom for strong expandability. 6Suitable for Canon 100400mmf4.55.6L ISII lens. Condition: Item Type: Lens Collar Base Foot Material: Aluminum Alloy Color: Silver Size: Approx. 82x38x30 mm/3.2x1.5x1.2 inches Weight: approx. 113g interface: standard 1/4-inch screw hole, 1/4-inch screw 1 x LensCollarBaseFoot1 x wrench