Product Description 3/8", Turbo Max, Jobber Length Drill Bit, Self-Centering, Precision Ground Turbo Max Feature 135 Degree Point Tip Eliminates Walking On Flat & Curved Surfaces, Stays Sharp Longer, 3 Flatted Shank On 3/16" For Exceptional Grip On Chuck, Manufactured With Premium High Speed Steel With Black & Gold Oxide Coating For Maximum Corrosion Existence. From the Manufacturer TurboMax Straight Shank Drill Bit, is 3/8-inch diameter, 3-pack. The Irwin TurboMax revolutionary Jet Point tip stays sharper longer. Independent tests show TurboMax drills almost twice as many holes as Bullet and nearly 1-1/3-times more holes than Sidewinder. Irwin tools are made of only the finest materials, manufactured to exacting tolerances.