It is good to know the Inner Dimensions (ID – the inside to inside distance of the outriggers) as well as the Outer Dimensions (OD – the outside to outside distance). If you notice in the drawing G represents the OD of the outriggers while F provides the ID of the outriggers. The outriggers for most stackers are adjustable to a certain point. This information is very useful if you are looking to, for example, clear a doorway or use a wider pallet.