High Quality Material - High Speed Steel Black And Gold, Resists Corrosion, Ensures Outstanding Durability, Sharpness And Capability, Reduces The Friction And Runs Cooler. | | Black And Gold Oxide Finish - Premium Gold Titanium And Black Nitride Dual Coating Can Apply Lubricant Better For Smoother Drilling And Is More Durable And Corrosion Resistant Than The Regular Black Surface. | | 135-Degree Split Point - Increases Cutting Speed With Self-Centering And Prevents Walking, Clears Chips And Particles Faster. The Split Point Tip Can Increase The Wear Resistance. 135-Degree Penetrates Hard Material Without A Pilot Hole And Produces Small Chips To Reduce Clogging. | | Set Includes - 8 Pieces 6 Long Silver Deming Drill Bits In A Heavy Duty Aluminum Storage Case For Easy Carrying And Organization: 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1 | | General Purpose - It Is Ideal For Drilling Steel, Copper, Aluminum, Brass, Oak, Maple, Mdf, Pine, Pvc, Polycarbonate, Acryli.