Best 1 3/8 drill bit
Milwaukee 48-25-5120 1-3/8-Inch Switchblade Selfeed BitCOMOWARE Step Drill Bit - Titanium Coated, Double Cutting Blades, High Speed Steel, Short Length Drill Bit, Total 10 SizesHiltex 10005 HSS Silver and Deming Industrial Drill Bit Set (8 Pieces), 1/2"SHDIATOOL Diamond Core Drill Bits 1-3/8 Inch for Hard Stone ...