The original Fredrix tongue-and-groove design that is the standard of the industry. Made of clear ponderosa pine and produced under close tolerance with the finest precision equipment. Each strip branded with the Fredrix name and length, and drilled through the lip for use on peg boards. Fredrix stretchers fit all brands that conform to the standard dimensions of 1 5/8" x 3/4".
13mm internal & 18mm external measurement.