The first tool is simply called the "AM100 Opening Tool". It's a plastic handle with a two-inch metal wire poking out one end, flattened at the very end like a small flatblade screwdriver. Come to think of it, all you'd need is a long, thin enough flatblade screwdriver, which would probably only cost you 50 cents instead of $26.
It is designed to open the American Lock's 10, 30 and key operated 100 series padlocks. It's been a while since I watched the instructional video for this, but if I remember correctly, it's simply a matter of inserting the tool all the way into the keyway, and twisting. That's really it! If it doesn't open on the first try, try the tool at different spots in the back of the keyway, I honestly don't remember exactly where you place it, but I know that's all you have to do.
The second tool is called the "AM700 Opening Tool". It looks exactly the same except that instead of a flattened end, it has a slightly curved/bent end, like the head of a hook pick (only round, not flat). A strong enough paper clip would probably do the same thing if you bent two millimeters of it at the end at a 45 degree angle. According to the catalog, it opens American Key Operated Padlock Series 700, 1105, 5100 and also all American Non-Key Retaining Padlocks (but does not work on new style locks with shields installed). By the by, all these numbers can usually be found stamped into the body of the padlock somewhere. This tool is the same for operation. . .just insert into the back of the keyway, twist, and the lock comes open.
The "Straight Knife" tool is pretty interesting, it's used to defeat certain filing cabinet locks and padlocks. This one I actually own, although I wouldn't have spent the $22 if I'd seen the video in advance.
Specifically, it defeats: (Filing Cabinet Locks) - Hon, Hudson, S&G, Yale, Chicago 6842, Craftsman, Eagle, Fraim and ILCO (old style). (Padlocks) - Slaymaker, Hercules, Imports, Ludell, Master 77, Sargent 752HS & 753HS and Taylor 781. Now, what all this means is that all these locks have a sort of spring-loaded latch at the back of the keyway. The Straight Knife is simply a thin, long, pointy knife. You could probably make your own by filing down the back of a flat pick handle into a long, triangular point (flat on one side, sloping away at a near-flat angle on the other, making the triangle shape). This one I am absolutely positive on how it works, because I have the instructions right here in front of me. For all of those locks, the same technique applies. . .you insert the knife into the keyway, flat side against the pins. Lift the knife up, raising all the pins as high as they can go. Push the knife as hard as you can against the back of the keyway, which hopefully will let it catch the latch. Now, still pushing, tilt the knife downward. This should move the latch and pop the lock open. Sometimes you may also have to flip the knife over before inserting, to get the proper rocking motion necessary to pull the latch down.
Basically, all these tools are totally effective for what they're meant to do. But they're not worth the money charged for them. . .I'd go ahead and make your own, and then keep a list of all the locks they work on packed in with them, just in case you ever run into them. Good luck, and happy bypassing!