Holes in medium gauge HVAC sheet metal. They cut beautifully, very smoothly and precisely, but remember that the accuracy you achieve with this or any other pair of scissors is highly dependent on your technique and skill level. The overall build quality is quite good and the cutting edges are precise and sharp. Time will tell how they hold up, but I have no reason to believe they won't last long with proper care. A good tool at a very good price. Solid 5 stars.