Introducing the 135° Cobalt Drill Bit 3/16 in. Set by POWERTEC. These drill bits were designed to provide you with a high quality and long-lasting set of optimal performance drilling accessories to accommodate your metalworking projects. Best used with stainless steel, iron cast and nickel alloy these drill bits were constructed for cutting and penetration durability for hard, abrasive metals. 135° split point drill bits: Ensures a clean, centered hole - reducing bit walking (wandering) while utilizing less force to remove metal material. M35 steel with 5% cobalt: Possesses a handy heat resistance, which prevents burn-up and improves the life of your bit. optimal compatibility: Works with both keyed and key-less drill chucks expanding your project drilling applications. long-term value: These drill bits should be considered a smart investment, as they can be repeatedly be sharpened without damaging the drill bits cutting edge ultimately extending the life of your tools and offering a low cost per hole drill.