Title: Toolant Drill Bit Set Compared: TiAlN Coated Bits for Metal—21pcs, Tested Performance Insight… We were intrigued by the Toolant Cobalt Drill Bit Set, eager to see how its 21 titanium aluminum nitride (TiAlN) coated bits would perform on hardened metal and stainless steel. The bullet-point tips promised durability, and we put them to the test. The set covers a wide range of sizes, from 1/16" to 1/2", making it versatile for various projects. On stainless steel, the bits cut smoothly with minimal resistance, though we noticed slight binding on very thick materials. The TiAlN coating did a fine job resisting wear, though the cobalt construction occasionally kipped on tougher alloys. Overall, we’re satisfied with the set’s balance of versatility and performance, though it’s not a top-tier professional solution. Still, for DIYers and hobbyists, it’s a reliable choice.