I needed a smaller boring bar for internal boring of small items on my mini lathe so I bought this one to try. I've used it several times and the function is great for both extreme boring and also performs almost flawlessly when facing aluminum.The carbide insert is a huge bonus and allows me to use it on harder metals than aluminum.It's strong and longer than I've ever needed before,but provides full-surface support by being in is inserted into the tool holder so that all screws rest againstβ¦