I bought the Malco Corrugated Steel and it worked well. Takes a little practice to approach the rib and start the rib but cuts fast, clean and is easy to follow a line. Mine is the version that mounts on a cordless drill. Had to trim between 1/2 to 1 inch of steel from about 30 sheets of steel for my shop interior. Faster that a Lenox metal blade on a 4.5 inch grinder, a fine metal blade in a Sawzall or any other attempt. Only thing faster on a 90° cut would be a full sheet shear designed for that profile.