Originally designed by Pitlock to protect people's Rohloff planetary gear hubs, this Pitlock M9 locking track nut set can be used with any 9mm diameter solid axle typically found on front hubs.
See the: Solid Axle Compatibility Chart
PITLOCK™ solid axle nuts use the same technology as the regular size locking skewers, however, they are 300% larger and designed to fit 9mm solid axles on road, track and mountain bikes. Because of the size difference, if you decide to use these nuts in conjunction with a PITLOCK™ seatpost or Ahead bolt, you will have to use two different keys. These bolts are a full 1-3/16" (1.1875") in diameter at the base. Make sure to measure the area around your dropouts to ensure that you have room for these. Many suspension forks have tubular lower legs that end too close to the dropouts.