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The MS-500D-B is a part from Miyamae of Japan and is a type of circular connector. It is designed for waterproof applications, and features a stainless steel housing with a black finish. It has three main features: a locking mechanism, an outer contact structure, and an inner contact structure. The locking mechanism prevents the connector from being disconnected unintentionally, and the contact structures provide reliable signal integrity for connection between the male and female connector. It has an IP68 rating which provides protection from dust, water, and other outside elements. It is made with a reliable stainless steel material and comes in a durable black finish.