I work as a scaffolder 58 hours a week in a power station. The two most important tools I keep on my belt are my hammer (I recommend estwing pro, made in the USA) and my Stanley Proto 7/8 speed combo wrench! I work this key all day, 6 days a week. It never slips, never fails, works just like the day I got it! I will never buy another key as long as I can turn it!