Milwaukee® Thunderbolt® Titanium Coated Drill Bits are designed for extreme durability and a longer life. The ThunderboltMD web is thicker than a standard drill bit, providing ultimate strength and protecting 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 and debris fast to keep the bit cool. The 135° split point delivers a precision start and prevents walking for fast, accurate holes. Effective in drilling on curved surfaces, MilwaukeeMD ThunderboltMD Titanium Coated bits require less effort to drill through wood, metal and PVC, and are highly recommended for use with portable drills. Includes two bits.