22/10/2026
What is a frame fillet?
Some framers might call this a spacer, but here at PI we refer to the thin strip of wood or mount board that’s placed under the rebate of a frame to create space between the artwork and the glass as a fillet. Most commonly used in box-style frames, a fillet isn’t visible when viewing the artwork straight-on but is revealed when viewing it from an angle. Fillets can vary in depth and be finished in a few different ways - they can be made in the same finish as the frame, they can be made in the same material as the mount, or they can be made in a contrasting colour or finish for a fun element of surprise or a pop of colour. We’ve pulled a few of our favourite fillets from projects these last few years to share with you here - which style do you like best?
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A thick timber painted mount and a thin walnut fillet was used to frame this large piece.
A thin pink fillet was used as a surprise pop of colour inside this orange Clover Frame.
Linen-wrapped fillets inside this waxed oak frame provide beautiful contrast to this Sara Dodd Marquette.
Magnolia mount board was used along the inside of this crimson box frame for this charming piece by Meg Fatharly. ♥️
Another fun pop of colour - neon green fillets were used in this small walnut box frame for this ceramic piece by .
Simple white fillets form the edge of the “pool” in this sweet multimedia artwork.
We chose extra deep fillets in complementary contrasting colours when framing these Kenyan fans for The Mount Room and we absolutely love the way they turned out.
Kelly Green fillets work to provide contrast between the frame and the white mount for this small floated collage. 💚