RPB21 metal brackets or yokes for holding currently manufactured low voltage light switches with on and off buttons that only fit one style of wall plates. This diamond-shaped bracket is used with particular switch plates in low voltage lighting systems common in homes built in the 1960's and 1970's. Mounting straps are designed to hold one or two lighting devices at a time (again - only fits the newly manufactured switches - not the old, original switches from the 1950s. Those old mounting straps have been discontinued.)