Allen wrenches: What you need to know

Everything you need to know about Allen wrenches in five minutes or less, including how they became ubiquitous.
How the now-ubiquitous tool became essential to mass production.

What Is An Allen Wrench?

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What Is An Allen Wrench?

Types of allen keys for bicycle maintenance – Bike Guru

Alternatives to an Allen wrench. #Short #JamesLesterBaldwin.

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Hex key - Wikipedia

Allen Wrenches - History, Use and Specifications

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What is an Allen Wrench? Different Types of Hex Keys & Their Uses

A History of Hex Keys and Allen Wrenches – Haus of Tools