As a mechanical engineer, I tried Luckyway's 13 Piece Titanium Plastic Aluminum Industrial and Scientific Drill Bits set. As a result of my tests, I determined that these are exceptional tools with high precision and durability .They smoothly cut through hardened materials and maintain sharpness for a long time. The titanium coating ensures rust-free usage, making them highly reliable for industrial purposes. However, the only downside is that these drills tend to produce a squeaky sound if not lubricated often. Overall an excellent purchase for industrial cutting tools..