Trine's smallest electric strike in the world is the 323478LC - the Cylindrical lock ANSI solution. With 3 face-plates included, 11-28 AC and DC power accepted, and a 1" total back set this strike can go in the tightest installs and is the best solution for installing inside concrete or wood frames. The strike body is a third the size of most electric strikes, allowing it to go where others cannot.
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