Hex wrench size chart

[Frank S]

Marv I think the largest hex key that I own is 1", and have only used it on hydraulic plugs. The largest hex key I've even seen was 3" and must have weighed 50 lbs I don't even want to try an visualize what that was used for But hey I used to have a 44 lb sledge hammer that a friend made for me because I was always saying if I just had a bigger hammer this job would be easy.