Klein Tools 3-Step Drill Bit, Double-Fluted, 7/8-Inch to 1-3/8-Inch KTSB15 - The Home Depot
Amazon.com: Klein Tools KTSB11 Step Drill Bit #11 Double-Fluted 7/8 to 1-1/8-Inch with Easy-to-Read Markings and Targets, 3/8-Inch Hex Shank : Industrial & Scientific