Things You'll Need
Instructions
Mark the angle of the bend horizontally on a 4-by-4 piece of lumber. Cut along this mark line. Secure the lumber to a table by placing a C-clamp on each end.
Lay the ribbed metal panel over the wood, lining up the bend line along the crest of the cut lumber. Hold it in place with your hand.
Lay a towel or other thick cloth over the metal to prevent damage.
Hammer the metal through the towel, bending it over the wood underneath. Continue until the entire length of the metal has been bent.