Review on Yakamoz Separate Cutting Welding Remover by Zach Peterson

I'm removing rusted floorboards from an old 1959 British car. I have to remove a million spot welds to get the old metal off. I will then install the new metal floor boards and MIG weld them through the drilled spot weld holes. This drill bit allows you to drill through a sheet of metal to remove a spot weld. But since I'm throwing away the old sheet metal, it doesn't matter and it doesn't save me anything either, since I need a hole in the sheet metal to weld the new floorboards. Given the higher price I think I'll just buy a dozen 1/4" cobalt drill bits for the rest of the work I need to do. If I ever need to salvage the metal I am removing they will be of help. , but I've never found myself in a situation like this on this project. Note that the photos show my "exercises" on an old piece of sheet metal, not the car itself.