I tried these bits on soft non-ferrous metal using the same CNC programs I use with other 1/8" carbide bits. The first one I tried ,the first was diving before lateral pressure was applied.The second broke within seconds.I've also done a lot of acrylic carving with the machine so I'll try them and update the review if they work.For now I certainly wouldn't recommend them for anything but very light work on small hobby machines.