Wow! After 10 years of low ribbed and R panning, this cutter is a dream come true. I would rue the days when I had to use a hand sander or saw to cut down a low rib. Today I used a 300ft 26 gauge point tool that went over the ribs, not very long and it worked great! Enough room for the handle to rise and fall without catching on the rib. It was easy to cut leaves all day, amazing! I should have gotten this many years ago. I hope this helps describe what this amazing product is capable of. Seems well made, worth every penny! Update: I tried using the punch tool on the white back of the low rib sheet metal. He didn't cut the valleys and used a hand sander to finish the job.