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, meets different shooting requires. 6. Lightweight and portable. Ideal for bird watching and shooting lovers. Specifications: Material: Aluminium alloy Color: Black Optional Size: F120-50, F250-50, F400-50 F120-50 Size (Length*Width*Thickness): Approx. 120*50*12mm/ 4.72*1.97*0.47 Inch F250-50 Size (Length*Width*Thickness): Approx. 250*50*12mm/ 9.84*1.97*0.47 Inch F400-50 Size (Length*Width*Thickness): Approx. 400*50*12mm/ 15.75*1.97*0.47 Inch F120-50 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, 900mm F250-50 quick release plate: Suitable for 200-500mm 150-600mm (400mm focus), lens 500mm focus and 420- 800mm zoom F400-50 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 Plate 1 * Wrench 2 * 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. .