Open End Wrench

J. H. Williams and Company
ca. 1925

Open end or "offset" wrenches are used to loosen or tighten nuts and bolts in difficult locations, such as the steam dome high above the boiler or in the front of the boiler.

Steel. L 46.4, W 7.9, T 1.6 cm
Steamtown National Historic Site, STEA 509