Review on HUAZHICHUN Straight 💪 Stainless: Unparalleled Strength and Durability by Travis Rogers

Your mileage may vary. But I was surprised when the tip broke off on one side and punched a hole through the brass. There was no lateral movement, it was in the drill press, properly aligned with the part held securely in a vise. This was also the very first use of this drill. If this happens with brass, I highly doubt these bits can work with hardened steel as they claim. The price is good, but buy at your own risk.