Milwaukee® Thunderbolt® Titanium Coated Drill Bits are designed for extreme durability and up to 3X longer life. The Thunderbolt web is thicker than a standard drill bit, providing ultimate strength and protecting against side-load breaks. A titanium coating reduces heat build-up and keeps the bit sharp for extended performance. A specially designed parabolic flute form clears chips fast, and the 3-flat Secure-Grip™ shank holds the bit firmly in the drill chuck. The 135° split point delivers a precision start and prevents walking for fast, accurate holes. Effective for drilling on curved surfaces, Milwaukee Thunderbolt Titanium Coated Drill Bits require less effort to drill through wood, metal and PVC, and are highly recommended for use with portable drills.