Milwaukee® Thunderbolt® Titanium Coated Drill Bits are engineered for extreme durability and up to 3X longer life. The Thunderbolt web features a thicker core than a standard drill bit to provide ultimate strength and protect against side-load breakage. A titanium coating reduces heat build-up and keeps the bit sharper for longer performance. A specially designed parabolic flute form clears chips fast, while 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 in drilling on curved surfaces, Milwaukee Thunderbolt Titanium Coated bits require less effort to drill through wood, metal and PVC, and are highly recommended for use with portable drills.