The FLIR IRW Aluminum InfraRed Window 4 (O.D. 5.01/127mm) is a high-quality thermal imaging accessory designed to provide a safe and efficient way to inspect and monitor electrical equipment. This infrared window is constructed with durable aluminum to withstand harsh environments and provide long-lasting performance. With a 4 size and an outer diameter of 5.01 (127mm), it is compatible with a wide range of electrical enclosures. The FLIR IRW Aluminum InfraRed Window allows users to safely inspect electrical systems using a thermal imaging camera without having to open the enclosures, reducing the risk of accidents and downtime. It features a scratch-resistant optic that ensures clear and accurate thermal images, while its easy installation process saves time and effort. Designed with user convenience in mind, this infrared window is an essential tool for maintenance professionals and electricians seeking efficient thermal inspection solutions.