This is a GN 40-60-M16-150-A0-UK threaded profile rail, manufactured by Elesa & Ganter. It is a 40 mm wide stainless steel profile rail, threaded with a 16 mm profile, with a length of 150 mm and with an A0 finish. The UK suffix indicates that the profile rail was manufactured to British thread standards. It is used to mount machine components of all kinds, such as handles, levers, knobs, hinges, and other items of hardware.