You peel off the cap shingles and a bit of the top edge of your roof decking far enough to get the nose of it started under the decking and work it down until the arms brace on the rafters/trusses and it will pry the roof deck, underlayment and shingles off in one big chunk.Maybe, if I knew what it was(google didn't help).
I also used it to rip nailed on decking off of good joists.
It's a very user specific tool. I was hoping a roofing company would see the add and want it. That is who could use it. It was worth buying it when we bought this house because the garage had to be take to the rafters and even some rafters replaced.
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