If you're working in machining or metalworking, this adjustable parallel set is seriously handy to have around! You get 6 different pairs that cover a range from 3/8 inch all the way up to 2-1/4 inches, which handles most common measurement needs in the shop. The height ranges are nicely spaced out: 3/8\ to 1/2\, 1/2\ to 11/16\, 11/16\ to 15/16\, 15/16\ to 1-5/16\, 1-5/16\ to 1-3/4\, and 1-3/4\ to 2-1/4\. Made from high-quality steel, these things feel solid and durable - not some cheap junk that'll wear out quickly. The screw locking mechanism is what makes them so useful - you can quickly adjust to the exact measurement you need and then lock it in place securely. They're perfect for layout work, inspection, setup jobs, or micrometer measurements where you need precise parallel surfaces. The length ranges from 1-3/4 inches to 5 inches when closed, giving you good versatility. They come in a nice Oxford cloth bag too, which keeps them organized and protected when not in use. At about 2.1 pounds for the set, they have some heft to them but aren't too heavy to carry around. Whether you're a professional machinist or a serious hobbyist, having a good set of adjustable parallels like these saves so much time and hassle compared to trying to stack fixed parallels. The quality is definitely there for the price - they feel precise and well-made. Definitely a smart addition to any well-equipped toolbox or workshop!