Everything (that can possibly be made to fit) I make in the shop or modify is made with 1/4-20 hardware. They generally use a 7/16" wrench.
The tool box has exclusively 1/4-20, 7/16" tools and fasteners I need to tap or ream or thread or insert,remove or install.
It sure makes life easy to know I can reach back behind my head, at arms length, and it's going to be a 7/16" fitment.
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