What's a Rabbet?
The rabbet is the recess on the back inside edge of the frame, into which the artwork fits. On pictureframes.com, "rabbet size" refers to the depth of this recess. For most framing projects, any rabbet size is fine.
Most of our metal frames have enclosed rabbets. When you're framing a very thick piece — like a stretched canvas — in a metal frame, be sure to choose one with a rabbet that will accommodate the thickness of the piece.
Custom-Made & Ready-Made Frames:
These frames have open rabbets, so they will work for almost any framing project.