Milwaukee® Thunderbolt® black compound wholesaler length drill bits are designed for extreme sturdiness and long life. The thunderbolt internet options a thicker core than a typical bit to produce final strength and defend against side-load breakage. A specially designed parabolic flute type clears chips quick, whereas the 3-flat Secure-Grip™ shank holds the bit firmly within the drill chuck. The 135° split purpose tip delivers a preciseness begin and prevents walking for quick, correct holes. Effective for drilling on flexuous surfaces, city thunderbolt black compound bits need less effort to drill through metal, wood and PVC, and are extremely counseled to be used with transportable drills.