I have the socket from OTC Tools part# 6006 and they list it as 1-11/16" http://www.otctools.com/products/dod...locknut-socket
, not sure what the metric equivalent would be. I got the OTC one because it's 1/2" drive and impact rated. you can get it from Amazon.com for $31. 36mm is what is on my truck that has independent front suspension and cv axles.