Matte Black Passage Handle Square | Nidus Lonsdale SeriesThe Nidus range of door hardware delivers on quality and style. The Lonsdale Square Passage Set is ideal for hallways and non locking doors and comes complete with everything you need to install and use this door handle, including the latch. The square 64mm x 64mm backplate is perfect for when you already have an existing 54mm hole in your door.