The space inside the frame is called the ‘throat’.
The measurement from the top of the frame to the saw’s teeth is called the ‘throat depth’. This measurement determines how far you can cut into a material before it hits the frame.
The deeper the saw’s throat, the deeper the saw will cut into material.
Some frame saws have a variety of different throat depths to choose from. These are the most common depths but they may not apply to every model: