Milwaukee Thunderbolt 23/64 In. Titanium Drill BitMilwaukee Thunderbolt Titanium coated drill bits are designed 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. The titanium coating reduces heat build up and keeps the bit sharp to extend performance. A specially designed parabolic flute form clears chips fast, while the 3 Flat Secure Grip shank holds the bit