This is a wireless testing case manufactured by ZERO Manufacturing Co. It is a military aluminum case manufactured in 1957. It is waterproof and moisture-proof, making it ideal for various purposes such as camera and drone cases. It has a decompression rotary switch on the front for air transport, and is airtight with the same structure as Zero Halliburton. The hardware is made by Nielsen. The rear is hinged instead of a buckle type, making it easy to use. Size: Height: Approximately 29 cm Width: Approximately 35 cm Depth: Approximately 19 cm It is in good condition for a surplus item.