Bought this 10mm spanner as a gift for a mechanic friend after reading the reviews. selected position (loosening) and tightens itself. I tried penetrating the grease and blowing it out with compressed air hoping it was just dirt, but nothing happened. holds the tiny "tongue" in place when broken or dislocated. π€ I just couldn't believe that the new key held up so little with light use. Next time I'll buy something else. Craftsman may be more expensive, but it hasn't let me down yet.π