I have not tested this and will be returning as I was looking for a minimum 8mm hole. It's more like a 10mm minimum hole. The neck is 0.291" in diameter and 1.17" in length. The rest seems to have worked.
Much better quality than most Tools I've Used Drilled a half dozen holes .375 over original diameter (.5 to .875) and a few from .5 to .55 with no problems.
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¦
Pros
boring bar type S05 SCLCR06; Shank 5/16"; Minimum hole diameter 0.315"; 4.00" length