I picked this up at Harbor Freight a while back, before I even started kegging, and it's the most amazing socket set ever:
http://www.harborfreight.com/21-piece-sae-metric-go-thru-socket-set-93150.html
They're 12-point and will fit pretty much any depth. Only issue is it doesn't go up to 7/8", so you'd be SOL there, but for the 11/16 it's great. Plus it's just handy to have around if you do any sort of automotive work, etc.
You can always go with the ratchet wrench set, even cheaper to cover your bases for all keg post sizes:
http://www.harborfreight.com/5-piece-sae-offset-ratchet-wrench-set-91885.html
http://www.harborfreight.com/21-piece-sae-metric-go-thru-socket-set-93150.html
They're 12-point and will fit pretty much any depth. Only issue is it doesn't go up to 7/8", so you'd be SOL there, but for the 11/16 it's great. Plus it's just handy to have around if you do any sort of automotive work, etc.
You can always go with the ratchet wrench set, even cheaper to cover your bases for all keg post sizes:
http://www.harborfreight.com/5-piece-sae-offset-ratchet-wrench-set-91885.html