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, which delivers ultimate strength and protection against side-load breakage. A titanium coating reduces heat build-up and keeps the bit sharp to prolong 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 for 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.