I bought this tool to repair/replace part of the aluminum above ground pool wall. I had to drill 25 1/4" holes in a straight line for 48" in both ends of two 4 x 10' 16 gauge aluminum sheets to replace the blasted pool wall. This tool made it possible to accurately punch holes without "wandering" and burrs like a drill. Worked fast on the 100th hole and just as good as the 1st hole!