Sliding Double Shutters - Double shutters are used mainly in sliding systems when a single panel exceeds the maximum recommended width. It gives the illusion of one very large shutter when actually it's 2. The centre stile on both shutters is reduced to give the effect of the standard stile width of 60mm. The stiles are 'biscuit' joined for strength. The double shutter option is also available for shutters that are fixed in place as a room divider or a 'hole in the wall situation'.