 Good evening, YouTube. Just watched Iceman's very nice video on the Abyss Titanium, and he had a couple of questions, which I hopefully have answers for. His first concern was where can you learn some more about security pins and what they're called and what they do and all the sort of stuff. So I'll get two books that I recommend. The first of which is this one. Mechanical locks, high-security mechanical locks and encyclopedic reference by Graham W. Pulford. You can find this on Amazon.com and other places, I'm sure. There are many illustrations of, oh man, yeah, I got the camera lined up good this time, many illustrations of pins, pen systems. Here's an example of some of the pins from a DOM-IX lock. Here is a Vincouse. I got that right. They're crazy rewarding and keys. He also talks about Ace locks, how they go together. Pretty much any kind of high-security lock that was around at the time when he wrote this book, he's got covered. Some very cool lever locks or cylindrical locks. He calls them cylindrical lever locks. Chub lock, even some automobile locks, things like that. So a very good book. And there's the ISBN. If you'd like to pick that up, that goes about $70 on Amazon. Then the other book, which is actually two books, is this Behemoth from our friend Mark Weber Tobias. Locks Safe Since Security. This is a very expensive set. I don't know, 1,500, 2,000 pages. But he goes through in gory detail everything you could possibly want to know about locks, metal or G, locking systems, Master King. I haven't even gotten to the second volume yet. It reads a bit like a textbook, but it has just a tremendous wealth of information. Just to give you an idea, I think I bookmarked the table of contents. So he goes through the tools you would want, materials and processes. They used to make things, how keys work, high-security keys, keying systems, different types of locks, specialized kinds of locks, entry methods, forensics. And then he goes into vaults and safes and security concerns. So even just the first volume is a very good read and a great reference for this kind of stuff. It's a little expensive, but I don't know. I thought it was worth it. So anyhow, if you could only have one of these books for the type of thing you're looking for, my apologies to Mark, but I'd have to recommend this book. It's not as detailed on a lot of things, but it gives you such a wide breadth of products that that's the one I'd recommend. The other question you had was about those funny little C-shaped clips, and those are called circlips. At least that's what I've always heard them called. And as I mentioned in my comment, they are often referred to by various expletives, profanities, because they're such a pain to get on and off, particularly off. I happen to have a set of these circlip pliers, which are particularly good for circlips that have little rings on the insides, but they work reasonably well if you think this particular set of jaws works pretty well for, for example, taking euro cylinders apart, things like that. And then, of course, you know, pliers and worst case, a hammer, something like that, or a saw, that sort of thing. Anyhow, circlip, C-I-R-C-L-I-P, I believe, and I think these were maybe $20 at my local hardware store. So, anyhow, so there you go. It's my take on it. Maybe some other people have some other recommendations for books or another name. For the types of rings that these things remove. One interesting thing here, you can actually set this up so that it can open the rings or close them. You swap it into this position, it can close them. So, very cool. Anyway, thanks for watching, and look forward to more videos. Keep it safe, keep it legal, and keep it legal, and have fun. Thanks, bye-bye.