Electrician's Step Bit Kit With 3 Step Bits Sized 7/8, 1-1/8, And 1-3/8-Inch For Creating Hole Cutouts In Panels And J-Boxes To Accommodate Most Commonly Used 1/2, 3/4, And 1-Inch Conduit, Two Spiral Flutes On Each Step Drill Bit Remove Chips And Help Pull The Bit Through Material for Faster Cutting, Titanium Nitride Coating Dissipates Heat For Longer Bit Life, 1/4-Inch Hex Shank For Firm, Positive Grip In Impact Driver And Standard Drill, Split Point Tip Quickly Starts Hole Cuts And Prevents Drifting When Pressure Is Added, Kit Comes With A Convenient 1-Ounce Oil Bottle For Lubrication Between Cuts To Prolong Step Bit Life, Rugged Case Snaps Shut With Custom Inserts For Each Bit And Oil Bottle, Total of 17 Hole Sizes