I can go measure my leaders, if you like, but my frame is a Hinterberg stretch. I would think all frames are fairly similar, but not sure. Offhand I do know that the leader on the bottom front pole (where I normally attach the backing bottom) is twice as deep as the other two. I have also seen a frame where the quilter made that bottom leader even longer, so it could be pulled completely over the other poles and have the edge lying on the panto table. This was so that she could easily attach her red snappers by pressing down on the table. (It can be hard for arthritic hands to press into red snappers because it requires some hand strength.)