A bayonet mount is a fastening mechanism consisting of a cylindrical male side with one or more radial pins, and a female receptor with matching L-shaped slot(s) and with spring(s) to keep the two parts locked together. The slots are shaped like a capital letter L with serif (a short upward segment at the end of the horizontal arm); the pin slides into the vertical arm of the L, rotates across the horizontal arm, then is pushed slightly upwards into the short vertical "serif" by the spring; the connector is no longer free to rotate unless pushed down against the spring until the pin is out of the "serif"(wikipedia).


Edison screw (ES) is a standard socket for light bulbs. It was developed by Thomas Edison and was licensed in 1909 under the Mazda trademark. Normally, the bulbs have right-hand threaded metal bases (caps) which screw into a matching threaded sockets (lamp holders). For bulbs powered by the mains supply, the thread is connected to neutral and the contact on the bottom tip of the base is connected to live (hot). In North America and continental Europe, Edison screws displaced other socket types for general lighting. In the early days of electrification, Edison screws were the only standard connector, and appliances other than bulbs were connected to the mains supply via light sockets. Today Edison screw sockets comply with international standards(wikipedia).

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Due to manual production process the product may contain traces of grease, sweat and, sporadically, blood. Nevertheless, traces of nuts are highly unlikely.