Features:1. Made of good quality aluminum alloy with CNC accuracy machining and surface oxidation treatment, solid and durable.2. Can be installed between long-focus lens and camera body, sharing the weight of the camera mount to protect long-focus lens and camera mount from damage, but also increase stability.3. Equipped with 2 bubble levels.4. With 1/4 screw interface, easy to mount cameras.5. Length options, 120mm, 250mm and 400mm, meeting different shooting requires.6. Lightweight and portable. Ideal for bird watching and shooting lovers.Specifications:Material: Aluminium alloyColor: BlackOptional Size: F120-38, F250-38, F400-38F120-38 Size (Length*Width*Thickness): Approx. 120*38*16mm/ 4.72*1.50*0.63 InchF250-38 Size (Length*Width*Thickness): Approx. 250*38*16mm/ 9.84*1.50*0.63 InchF400-38 Size (Length*Width*Thickness): Approx. 400*38*16mm/ 15.75*1.50*0.63 InchF120-38 quick release plate: Suitable for 18-200mm 18-270mm 18-300mm 24-135mm 55-200mm 55-210mm 55-250mm 55-300mm 70-200mm 70-300mm 75-300mm 80-400mm 100-400mm refraction mirror S500mm, 600mm, 800mm, 900mmF250-38 quick release plate: Suitable for 200-500mm 150-600mm (400mm prime), lens 500mm prime and 420-800mm zoomF400-38 quick release plate: Suitable for Some lenses of 600mm focus and 800mm focus and 650-1300mm. (Note: some models are only for reference, not includes all models)Packing List:1 * Long Focus Quick Release Plate1 * Wrench2 * 19mm Screw.Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.