Fredrix Cross Braces allow you to add extra reinforcement to larger art canvas frames on standard, gallery or heavy duty depth bars. The length is cut-to-fit the inside dimension of stretcher strips. Fredrix cross braces are attached to the back of the stretcher bar. FREDRIX reduces waste and improves stability with the use of finger joints and all are knot-free. FREDRIX sources wood from managed sustainable forests primarily in the North Western U.S.Details:Unfinished24" lengthFits inside stretcher strips (sold separately)