Guarantee panel flatness during glue up when you use this clamp. The 4-way action applies even pressure to the panel faces. Perfect for gluing table tops furniture panels and doors. Buckling is eliminated. Accepts material up to 3-1/2" thick with unlimited width capacity determined by the length of the 1-1/2" x 1-1/2" clamp beam that you supply. You'll want one clamp for each 18" of work piece length.