I’ve never broken a wrench outright, but I’ve badly damaged both the wrench & a fastener by adding a length of pipe to the wrench handle for extra leverage.
1 inch wrench? hmmm… I thought that meant it measured one inch from flat surface to flat surface, the surfaces being 180 degree apart. Does the geometry imply 1 3/16 corner to corner?
Reminds me, one thing that confuses diyers, a one inch wrench doesn’t fit a one inch bolt. The size of the bolt is the diameter of the threaded portion, unrelated to the dimensions of the bolt head.