Held up very well cutting 304 stainless even under sub-optimal feeds and speeds, which were the limitations of my CNC. I tried another different brand popular carbide end mill on the same job for comparison. The other end mill ground itself into a needle due to intense heat. But this ZHY came out of the same job intact and still sharp.

I bought this product to replace two cheap mills that were junk and were received with chipped cutting edges. This End Mill is much higher quality. Very Nice.