feature: 【Suitable for】Suitable for EF 70-200mm f/4L USM, EF 70-200mm f/4L IS USM, EF 300mm f/4L USM, EF 400mm f/5.6L USM. 【Preferred Material】Aluminum alloy structure, rust-proof and lightweight, durable for use. 【Stable work】Using fixed studs, easy to install and easy to use. Can help you hold and balance your telephoto lens, which is heavy and hangs in front of the camera. It is a good helper for photography enthusiasts and brings you a better shooting experience. Specification: Condition: 100% Brand New Material: Aluminum Alloy Color: Shown as pictures Base Mount Interface: UNC 1/4inch Diameter: Approx. 7cm / 2.7in Inner Diameter: Approx. 6.5cm / 2.5in Weight: Approx. 122g Packing List: 1 * Lens Tripod Mount Ring Other devices on pictures are not included. 【Suitable for】Suitable for EF 70-200mm f/4L USM, EF 70-200mm f/4L IS USM, EF 300mm f/4L USM, EF 400mm f/5.6L USM. 【Preferred Material】Aluminum alloy structure, rust-proof and lightweight, durable for use. 【Stable work】Using fixed studs, easy to install and easy to use. Can help you hold and balance your telephoto lens, which is heavy and hangs in front of the camera. It is a good helper for photography enthusiasts and brings you a better shooting experience.