End Mill Set Metric CNC Milling Cutter Union Butterfield Tungsten 4 Fultes accupro Carbide Rotary Bits Tool Straight Shank 2-12mm 8pcs

You probably wouldn't expect them to act the way you would. The are modestly priced and are capable of handling mild cold rolls or such, but I would prefer to use something else if I needed an excellent stainless. You can use carbide or even ceramic insert type tooling for high quality work. The mills have proven to be excellent for machining steel alloys, plastics, wood, and even aluminum for the price they cost. The steels used for stainless steels and high chrome steels are hard and require hardeners just as hard or even harder. Once, I had an engine machine shop and a customer had brought me a Mercury Outboard motor that needed sleeves in the piston bores and then it had to be re-assembled Wrap them in a sleeve. They in fact were a "plating" (thick) and could not be displaced thermally or by any other means. After my boring bar was mounted on my drilling bar, I cut out the ceramic inserts with a ceramic insert cutter. As soon as I understood what to do, I was able to use it. In my experience, my tungsten carbide bit would chatter and break when I used it on bores. Please let me know if this helps.

It rarely happens. There are some poor quality parts here.

The product is made