I'm not looking forward to ever needing the 46mm socket for the big rear axle nut, but have always kept that measurement (and its standard 1 13/16" equivalent) in mind in case I trip over one, which I recently did. �Of course, after buying I find that NAPA stocks the non-metric one for $25 (on sale this week for $16!) but that Ohio antique mall was fairly boring until I hit a huge booth full of tools and the $5 find that is now living under the back seat of the '87 Westy with its new Harbor Freight 3/4" drive breaker bar.