Irwin 10239 Unibit9 7/8-Inch and 1-1/8-Inch 1/2-Inch Shank Step Drill Bit for-1/2-Inch and 3/4-Inch Conduit
UNIBIT 9 2 Hole Sizes (7/8" and 1-1/8" )for 1/2" and 3/4" KO