Another favorite tool of me.
It’s perfect for cutting out new parts out of sheet metal. You can do this quite accurate if you want, but you need a steady hand.
Mostly I cut out the shape roughly and fit it on. Then remove the rest with a grinder or plier.
Also perfect for cutting out rusty parts out of your car.
Watch out with the sharp waste material that falls on the ground. It vreates punctures in bicycle tires.