Guys, these are Hex Socket Head Screws, not Allen screws. The tools are Hex Keys. As for Allen, that was the company that produced the early Hex Keys and sold them thru Hardware Stores. I will also note that Hex Socket Head screws are common on industrial machinery because it's a lot easier to carry a 12 inch piece of 3/4 inch tubing and a pack of hex keys than it is to carry a small toolbox. All you have to do is slip the hex keys in your back pocket and tuck the tube into your belt and you are good to go for a lot of basic repairs or tool changes. As for why the Pipe, it's for leverage.