The BKZ series from Switchcraft solves the common problem of accidental disconnection of a power supply by adding a sturdy twist-lock to their most popular form factor. The intuitive design simply requires the user to twist the plug once when plugging it in, which in turn prevents it from being removed until it is twisted in the opposite direction. Like other Switchcraft jacks and plugs, the BKZ series is made in the USA to the highest quality standard.