The width advanced mate relates to the adjustment of surfaces in relation to each other in what is commonly known as the width dimension. A common application of the width mate is in mechanical joints and mechanical slots. For example, take note of the mechanical joint in the following screenshot. The width advanced mate will help us to build relationships between the Inner Joint and Outer Joint:

These relationships include the following: 

• The Inner Joint moves freely between the space allowed by the Outer Joint boundary. 
• The Inner Joint is centered in the space allowed between the Outer Joint. 
• The Inner Joint is fixed to a certain distance or percentage within the Outer Joint boundary. 

Now that we know what the width relation does, we can start applying it next.