The very best and base sections on the shutter are referred to as Rails these are typically jointed in to the stiles to create a frame. These rails are adjusted in width dependent within the overall height of one's shutter. Where measuring around 1800mm, excess rails are mounted inside the height on the shutter, to offer excess toughness on the shutter. These are generally generally known as Mid Rails and so are best linedup which has a attribute in your window i.e. transom bar on UPVQ or doorway handles and so forth.