DOUBLE PANEL CLAMP The clamp is made of steel with aluminum roller bearings and will handle any length project. The design really lends itself to extreme downward pressure while you tighten the edge clamping screw. Ideal for face frames. If you use 2*2 stock(not included) you can clamp better than 3-1/2" thick stock. For greater capacity use thinner than 2*2 stock. You have twelve individual settings along with simple instructions, wood not included. We recommend one clamp every 16 inches. Two clamps shown.