My 2615 wheel lugs are 22MM. The frame and some loader bolts are 22MM some are 24MM. (Note: Some metric sets don't include 18MM or 21MM wrenches or sockets) I bought a few 18's & 21's separately. I found a lot of those sizes in use on todays cars / trucks. I bought a set of deep and std. impact sockets at Harbor Freight a few years ago. Still going strong and I do use an Impact Air gun with them. I won't buy the std. sockets from them, only the impact gun type which are thicker walled. As for thin wall sockets, I buy from Sears (Craftsman). I've had one set that has seen over thirty years of weekly use. When and if they break I still get a free replacement.