Grand DA-21U

Milwaukee Thunderbolt Black Oxide jobber length drill bits are designed for extreme durability and long life. The Thunderbolt web features a thicker core than a standard drill bit to provide ultimate more→strength and protect against side load breakage. 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 degree split point tip delivers a precision start and prevents walking for fast, accurate holes. Effective for drilling on curved surfaces, Milwaukee Thunderbolt Black Oxide bits require less effort to drill through metal, wood and PVC and are highly recommended for use with portable drills.

Featuring a heavy-duty, full-length, heat-treated shank for protection against bends and breaks, DeWalt Spade Bits are equipped with high-performance cutting spurs for optimum hole finish.

FlexTorq bits are engineered for durability. Every FlexTorq bit features a FlexTorq zone designed to absorb impact for longer life. Save time and find the right bit with the new highly-visible laser-e more→tched size. Each FlexTorq bit is impact-ready with a 1/4 in. hex shank for use in impact drivers and drills.