Special latching cylinders with levers that enable the latchbolt to be held in retracted position. This cylinder type hold-back can only be applied or released by the key. These special latching cylinders are available on application and are supplied ex-factory handed to suit lock function. To apply hold-back: Insert key into cylinder and retract bolt with one full turn of key. Hold bolt depressed with finger and withdraw key. To release hold-back: Insert key into cylinder, rotate key one full turn and withdraw key.
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