I've tried OScarbid tools before, but the quality sucks. I ordered 5 extra bits and the first 3 fell out within minutes when milling on the part at very low feed and 70rpm on a lathe with full coolant. The carbides just explode. The first didn't even cut, it squeaked like a cat in a cauldron. The insert failed completely and tore the tool holder. The next two simply split in half, down the middle as shown in the pictures. I completed, sharpened and centered the parting with HSS China Parting…