A friend wants to sell me some combonation wrenches he inherited from a relative that he has no interest in. They are Metric sizes, 23mm, 24mm, 25mm, 26mm, 27mm, 30mm I think one or two others. I'm inclined to buy them because the largest in my tool box now is only 22mm but in reality I wonder if I will ever use some of the larger sizes on a pagoda, what is the largest wrench size I may need a combonation wrench for?