powertools - Want to know how hex bit shank works and the history

I have tried to search this in google but I haven't found a complete explanation, so I ask this here. I also have read other answers related with hex bit socket, but it still not satisfied. How the

powertools - Want to know how hex bit shank works and the history behind it's design - Home Improvement Stack Exchange

powertools - Want to know how hex bit shank works and the history behind it's design - Home Improvement Stack Exchange

powertools - Want to know how hex bit shank works and the history behind it's design - Home Improvement Stack Exchange

powertools - Want to know how hex bit shank works and the history behind it's design - Home Improvement Stack Exchange

powertools - Want to know how hex bit shank works and the history behind it's design - Home Improvement Stack Exchange

1/4 Hex Shank 3/8 Thread Drill Chuck Adapter w Lock Screw

Torx® Hex Shank Heavy Duty Comfort Grip Screwdrivers

Hex Shank Socket Driver Set, 3-Piece

Hex Shank Drill Bit,High Speed Steel Plated Hex Drill Bit Hex Drill Enhanced Features

Mastercraft Hex Shank Drill & Drive Set for Wood, Metal, Plastic