If you build your own tanks, or think you might some day, you have to have one of these tools. I picked one up from Jim at Tulsa's contest and made my first tank with it today. Sure beats trying to line up two pieces of flat steel with two "C" clamps and trying to keep it all straight. Makes tank building a breeze except for those pesky end plates. I even used Jims tool to bend two of the sides on those. Try one! You will like it.