Union Butterfield 1994(UNF) High-Speed Steel Combination Drill and Tap, Uncoated (Bright) Finish, Round Shank with Square End, 5/16″-24 Thread Size 2.9 out of 5 stars 2 $43.85 $ 43 . 85
https://www.amazon.com/Combination-Drill-26-Taps/b?node=6001488011

