From the Box:
Dungeon Floor Plans is a specially designed role playing game aid for adventures using 25 mm miniatures. The advantages of using floor plans are: they regulate movement and combat, create an atmosphere of realism, simplify mapping, and are easily adaptable to suit virtually any dungeon configuration.
Each sheet is superimposed with a square grid which represents 5'x5' to the scale of 25 mm miniatures. It will be necessary to cut out features and desired lengths of passageways, rooms, etc. along the grid lines using scissors or a sharp modelling knife.