I had to install a pair of double prehung doors this week. Solid core, so were pretty heavy. I did have a helper. These Win Bags were unbelievable! With double door set up we are dealing with six planes. A pump here, ease off there, we were able to get the doors lined up with consistent reveal all around in half the time it would normally take. The time saved on this and the next job I use them for justifies ordering two more....