The saw arrived with missing and bent teeth but I tried it anyway. It cut through two layers of 3/4" plywood well, but I wouldn't use it for anything other than fairly soft wood. Have I actually tried this on aluminum or cast iron? NO! But judging by the way he's doing it cutting plywood I think it would be inefficient at best and dangerous at worst.The teeth are quite large and if you buy this saw be careful when you start sawing - it's best to lower the saw slowly and tilt it easily into the cut.Try to start cutting too quickly and you could break your wrist if your teeth get stuck.