Each FREDRIX gallery stretcher bar measures 1-3/8" x 1-3/8" and features a tongue-and-groove design. FREDRIX reduces waste and improves stability with the use of finger joints and all bars are knot-free. The wood is sourced from managed sustainable forests primarily in the North Western U.S. Bars are kiln-dried and precision cut using state-of-the-art computer driven milling machines to ensure a smooth and tight fit. Features a gradually tapered lip for maximum clearance.Details:UnfinishedAvailable in multiple lengths1.375" x 1.375" (3.5cm x 3.5cm)Kiln dried and precision cutSustainably sourced wood