I machine a lot of oxygen free high conductivity copper that is very gummy. I found a few of these very high positive 1" shank tools and wonder if anyone knows of a source for them. I'm on my last one. They are the only tools that really work for turning this copper. The bars of copper are 3 1/4" dia and 42" long and finish at 3.000" with a finish for "O" ring sealing. The mat'l is over a thousand per piece. Any other cutter has a tendency to quickly gum up and dig in, creating a deep pit or groove out of the blue when turning. I'm using the high Sulphur dark cutting oil. I am not allowed to weld or fill a defect and even with a lot of cutting oil it is scary watching it cut, knowing any second it can grab and destroy the part. I trust this cutter in the picture and need several more.