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.
www.tekton.com

Angle Head Open End Wrench Set (12-Piece) | TEKTON | WAE90205
Includes: 8-19 mm (Metric) angle head wrenches with 30° and 60° open ends. Made in USA. No skipped sizes. Comes with holder. WAE90205.