Milwaukee® Thunderbolt® Titanium coated drill bits are engineered for extreme durability and up to 3X longer life. The Thunderbolt web is thicker than a standard drill bit to deliver ultimate strength and protect against side-load breakage. A titanium coating reduces heat build-up and keeps the bit sharp for extended 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 tip delivers a precise start and prevents walking for fast, accurate holes. Effective for drilling on curved surfaces, Thunderbolt Titanium coated drill bits require less effort to drill through wood, metal, and PVC, and are highly recommended for use with portable drills.