[ Screen Size ] : 1.65 in * 1.22 in * 1.18 in / 42mm * 31mm * 30mm. [ Apply to ] : Sight Lens Protector is suitable for 551/552/553 type holographic sight scope, it is perfect for airsoft and paintballing. [ High Quality ] : Newly upgraded transparent plastic screen, durable and higher transparency, no distortion of line of sight, avoid damage to holographic line of sight. [ Easy to Use ] : The airsoft sight cover is tool-free installation, easy to fix or disassemble, very convenient to use. [ What You Get ] : 1 sight cover and friendly customer service (If you have any questions, please feel free to contact us by email, we will serve you wholeheartedly).