7 mm hex key - old handlebars, cranks & more - Bike Gremlin US
: Used for some vintage quill stems, seat posts, and specialized handlebar clamps.
The 7mm Allen key (or hex wrench) is a metric tool frequently described by DIYers and mechanics as "the missing link." While it is technically a standard metric size, it is notoriously absent from most basic consumer sets, which typically skip from 6mm to 8mm. Common Applications
