Sometimes a little more reach is needed. You can either use a socket extension or, for a more direct approach, one of our 236/2HXL Long Hex Bit Sockets.
We carry the 10mm specifically for Campagnolo cranksets. The hex portion of the tool is 66mm long, plenty to reach to the middle of that crank spindle. The tool has a 3/8″ drive. More sizes coming in the future.