How to Measure the door for a Night-latch |  | Please note if replacing an existing night-latch the measurement 'A' is either 40mm or 60mm - this is the measurement from the edge of the door to the centre of the hole (where the rim cylinder goes in). Measurement 'A' is more commonly known as the backset.
You therefore can choose any of the following night latches if you are fitting a nightlatch from 'fresh'. If replacing the night latch ensure that you choose either a 40mm or 60mm backset nightlatch. |
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