1Made of good quality aluminum alloy with CNC accuracy machining and surface oxidation treatment, solid and durable. 2Can be installed between longfocus lens and camera body, sharing the weight of the camera mount to protect longfocus lens and camera mount from damage, but also increase stability. 3Equipped with 2 bubble levels. 4With 1/4 screw interface, easy to mount cameras. 5Length options: 120mm, 250mm and 400mm, meets different shooting requires.Features: 1. Made of good quality aluminum alloy with CNCaccuracymachining 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 toprotect 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 55-250mm55-300mm 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.