VEVOR Core Drill Bit, 1" Wet Diamond Core Drill Bits, 14" Drilling Depth Concrete Core Drill Bit, 5/8"-11 Inner Thread, Laser Welding, Diamond Wet Coring Bit for Concrete Brick and Block

What is the outside diameter of the bit where it connects to the drill? I’m wondering if I can use an extension with the 1” bit to drill more than 14” deep, but need to know if the entire bit can fit through a 1” hole. Thanks!