How to shape this metal?
Here is a link to a hand-bending jig. Basically you need two or more pins to hold the metal and you either use the metal itself (with the pins held in a vise or table-top) or a handle attached to the pins (with the metal held in a vise) to bend the metal.
What I'm saying in my comment is that the item you pictured is not made of bent metal, it's made by welding a short section of pipe to a steel plate. A bent tool holder does not logically have the same form to achieve the same function, and trying to make it &quot;look like that&quot; will make the job much harder than it needs to be.
Some more options: One.  Another. Scroll down a bit in the last link (a newsletter for blacksmiths) and there's a &quot;how to use&quot; section.
Sorry for the link-heavy answer, I'm not up to drawing the pictures and trying to explain in more detail right now. Someone else can take a stab at that.