"notbob" wrote

I do know one thing. Almost all metric sizes will fit any SAE size
fastener, although perhaps a bit loose or tight. I doesn't work the
other way around. If you can only afford one std, get metric.

nb

11/16 works well on a 17mm nut. Over time though, any wrench used on the
wrong size will eventually damage the nut or bolt head. OK in an emergency,
but only a hack would do it on a regular basis.