1. It is of good quality. 2. This quick - release plate can replace the Manfrotto 577 and is compatible with Manfrotto tripods. It offers multiple installation methods for cameras and tripods. 3. Product features: - This quick - release plate can replace the Manfrotto 577 and is compatible with Manfrotto tripods. - It is equipped with one 1/4 - inch and one 3/8 - inch screw for installing cameras or camcorders. - There are two 1/4 - inch and one 3/8 - inch screw holes on the bottom, which can be used to install pan - tilt heads, tripods or camera dolly tracks. - The base is equipped with three shooting inclinometers (horizontal and vertical), which helps with calibration. - The quick - release sliding plate is compatible with Manfrotto 501PL and 501PL (long version). - The plate is equipped with a solid locking screw, a safety pin and a non - slip pad, which can provide a reliable installation for the camera. - It adopts a metal structure machined by precision CNC machine tools, which is relatively strong and durable. 4. Specification parameters: - Brand: Andoer - Compatibility: Compatible with Manfrotto 577 - Product size: 100×90×20 mm (3.9×3.5×0.78 inches) 5. Package list: - One quick - release plate 6. Notes: - There is no retail packaging. - Conversion: 1 centimeter = 10 millimeters = 0.39 inches. - Due to manual measurement, an error of 0 - 1 centimeter may occur. Please make sure you can accept this before placing a bid. - Due to differences in different monitors, the pictures may not show the actual color of the product. Thank you for your understanding.