This is a Murr Elektronik cable gland, model number 7000-94021-6160100. It is a standard, 10mm, IP67, brass cable gland. It is used to secure cables, such as power and control cables, in an outdoor or harsh environment. The cable gland has a wide range of features to make installation easier, such as pre-mounted tore locking washers, an integrated seal and an adjustable cable tie mechanism.