Step Bits Are Coated With Aluminum Titanium Nitride And Are 10 Times More Durable Than Steamed Black Oxide Coating For Longer Bit Life, Impact Rated Shaft Allows For Use With Impact Drivers And Standard Drills, Double Spiral Flute Removes Chips For Faster Cuts And Drilling, Laser Markings Are Easy To Read For Quick Size Identification, Fast-Starting, Non-Walking Drill Tip, Quick-Release, 1/4-Inch Hex Shank Provides A Firm, Positive Grip And Won'T Spin Out In The Drill, For Use On Steel (Up To 16 Gauge), Wood, Plastic, And Aluminum, The Compact, Modular Case Comes With Cutting Oil And Is Designed To Nest Neatly Within Modbox™ Toolboxes And On The Modbox™ Case Adapter Side Rail Attachment