Drilling through extremely hard material including Titanium, Boron, Ultra-Strength, and even Stainless Steel is easy with ProMaxx Tool's PMXSSSC125 Gold Drill Bits 3-Pack Small. These drill bits exceed Aerospace Specifications. These are the best drill bits for drilling out exhaust studs and more. Drilling metals introduces many challenges including the hardness of the metal, accessibility, and the thickness of the material. Finding quality, long-lasting drill bits to meet the above conditions is becoming more difficult today. Our gold tooling is machined turned right here in the USA and engineered to not only handle a wide variety of material types and hardnesses but it is also manufactured to a specific tolerance to ensure the most accurate and trouble-free drilling today. That is why we call it tooling, the same high quality used in high-speed machine shop operations. As a technician, we know your time is valuable, so we designed our bits to punch through quickly and accurately to deliver the predictable results you expect.