Maybe old info, but surprised at the manufacturing in USA. Don’t know if these are actually useful over common wrenches. Randomly picked a set just to show their advertising about the process and features.
https://www.tekton.com/angle-head-open-end-wrench-set-12-piece-wae90205
https://www.tekton.com/angle-head-open-end-wrench-set-12-piece-wae90205