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
6pcs 1/8-3/8'' Thread HSS High Speed Steel Drill And Tap Bits Set 1/4" Hex Shank | eBay