Masterpiece Heavy Duty Cross Braces are professional grade and constructed with the same quality and care as Masterpiece stretcher bars. They are made of clear, solid fir, with no finger joints. Braces fit snuggly into the slots on the stretcher bars, and can be further wedged for an extra firm fit. All Cross Braces come as a pair of braces, which fit between the stretcher bars and the internal Straight Brace. Size given is the outside dimension of the canvas frame. A Cross Set is never used without a Straight Brace. It is possible to use two or more Cross Sets on one long, rectangular canvas. All Straight Braces span the entire internal length of the canvas frame. Size given is the outer dimension of the canvas frame.