Attention machinists and DIYers! This 6-piece High Speed Steel end mill set has everything you need for those precision milling jobs. You get ball end mills (that's the round-ended ones) in the most useful sizes: 1/8, 3/16, 1/4, 5/16, 3/8, and 1/2 inch. The 4-flute design means smoother cuts and better finish on your workpieces. Oh, and they're center cutting too, so you can plunge right in without needing a pilot hole. The smaller sizes (1/8 through 3/8) have 3/8 inch shanks, while the 1/2 inch mill has a 1/2 inch shank - perfect for most milling machines and CNC setups. They come in this really nice wood stand that keeps them organized and protected when you're not using them. LittleMachineShop.com sources these quality tools - they're a small US business that really knows their stuff when it comes to machine tools. If you have any questions about compatibility or features, they've got actual knowledgeable people you can talk to (remember when companies actually had customer service?). Whether you're working on a hobby project or running a small shop, this set will handle most of your milling needs. The HSS construction holds up well to most materials, and having the right size for the job makes all the difference in your finished product. Seriously, your machining projects just got a whole lot easier!