Yale 85/89 Nightlatches
Product Description
This is the more modern version of the traditional nightlatches featured at the top of this page, with the added feature of a double locking mechanism. The double locking operates by putting the key in the outside cylinder upon exit and turning in the reverse direction. This will double lock the handle on the inside stopping a thief breaking the glass and letting themselves into the property. Careful consideration should be given when fitting to give the building occupants clear instructions in use, as it is possible to lock someone within the property if the handle is double-locked with an occupant still inside. Not therefore recommended on single entry / exit door dwellings: Use item 'A' in these situations. Backset is measured from the edge of the door to the centre of the keyhole.