NASA NTRS · 19930000587
Pivoting-Head Wrench
Abstract
Wrench ends pivot so it can be used to loosen or tighten nuts or bolts in confined spaces. One end equipped with open-end socket; other end, with double-hexagon socket. Heads pivot on pins. Pins fit tightly so heads do not flop; friction on pins sufficient to hold heads in positions until rotated intentionally.
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Bradley, Glen L.. 1993-09-01. Pivoting-Head Wrench. https://ntrs.nasa.gov/citations/19930000587
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