Blind stop — installs inside the exterior blind stop (a flat ledge ~1" deep just outside the existing window). Manufacturer adjusts your measurement to fit. Models 404 / 606.
Overlap — sits on top of the exterior trim/casing. Manufacturer adjusts your measurement to fit. Models 450 / 650.
Tip to tip — provide the exact overall dimensions of the finished product. No manufacturer adjustment applied — the window is built to the size you enter.
