Milwaukee 25/64" Thunderbolt Black Oxide drill bits are engineered for exceptional durability and long-lasting performance. Featuring the Thunderbolt web with a thicker core than standard drill bits, these bits superior strength and resistance to side-load breakage. The specially designed parabolic flute rapidly clears chips, while the 3-flat Secure-Grip™ shank ensures a firm hold in the drill chuck. The 135° split point tip provides a precise start and prevents walking, enabling fast and accurate hole drilling. I for curved surfaces, these black oxide bits require less effort when drilling through metal, wood, and PVC, making them highly suitable for use with portable drills. Model Number: 48-89-2731