I received my set today and went to check all was in order and found the set is missing no a 31mm socket. I re-reviewed the description and found the 31mm is omitted. It does not appear to be a mistake as the case couldn’t hold any additional sockets anyway. Strange If I ultimately end up needing a 31 I will be pissed. Overall the quality seems decent for the price. Time will tell if the sockets are the correct sizes and how they hold up. If you need a 31mm, this is not the set for you.