Allen

The Allen wrench trademark of the Allen Manufacturing Company of Hartford, Connecticut was taken out in 1943, and Allen became such a successful brand of hex key that many consumers in subsequent decades have assumed that the internal-wrenching hexagon drive was invented by someone named Allen. This idea abounds in print and on the web; it sounds very plausible but is in fact inaccurate! We stock both metric and imperial Allen Keys, in standard, long series, and ball ended varieties.