Allen Wrenches - History, Use and Specifications

Allen Wrenches, or hex keys as they are commonly called, have been around since the mid 1800s but were made into the common wrench you see today by Allen Manufacturing Company out of Connecticut in the early 1900s. Allen Wrench is the six-sided L-shaped wrench used to drive hexagon recessed socket screws.
Quick history on Allen Wrenches (Hex Keys) with common uses, benefits and specifications.

2/2.5/3/4/5/6/8/10mm Flat/Ball head Hex key allen wrench Hand tool Universal Quick Snap Adapter Chrome Vanadium Steel hexagona - Price history & Review, AliExpress Seller - Yueqing TaoQi Electric Co., Ltd. Store

Everything You Need To Know About Hex Key Sets

Allen Hex Key L Type Wrench Fastener Bolt Nut Hand Tools - China Allen Hex Key, L Type Wrench

Monster Bolts - Fastener news

The Ultimate Guide to the Wrench — How to Use a Wrench

NINDEJIN 5-10pcs L shaped hex hexagon key allen wrench 0.9mm 1.5mm 2mm 2.5mm 3mm 4mm 5mm 6mm 8mm carbon steel allen key - Price history & Review

The History of the Allen Wrench - Garden Guides

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

What Is An Allen Wrench?