Well made hole cutter! I especially like the spring on the center bit. It pushes the metal sheeting slug out so it's ready to drill another hole right away. I'm using it on a drill press to cut holes in old Fe/Cu alloy sheeting that was used on an aqueduct (built around 100 years ago). As long as you drill slower rpms and the sheet is secured well (can't move when being drilled) the hole cutter leaves perfect holes. I've have 3 sizes: 1-1/8", 1-3/8" and 1-9/16" and all work perfectly. I've yet to cut anything but thinner metal sheets. I've also not used the hole cutters very much yet so do not know how long lasting they'll be. So far I'm very pleased with this product. They are the best hole cutters I've used.
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