The No. 31 race drivers fit all tapered roller (timken style) neck bearings that have a 1" diameter steer stem. They make quick work of removing old races and installing new ones.  These work on both external neck cups, and tube-style necks that have the race pressed directly into the frame.
 
This style of race driver has been commonplace in your professional Harley mechanic's toolbox for many years.  But Fast Eddy Co. race drivers are far superior to the all the others. 
 
Traditional race drivers worked well... there were just two problems with them: 
1) the sharp lip on the tool would wear out-  Fast Eddy Co. solution:  ours are made from the best American  tool steel available, and are heat treated to reduce wear while also maintaining toughness.
2) the race drivers were clunky and difficult to get into position in the race-  Fast Eddy Co. solution:  race drivers feature strong magnets that keep them in place while you slide in the driver handle and wedge spacer.
 
Using these tools with magnets is truly a game changer!!!  You no longer have to try and hold them in with one hand while you slide in the driver handle.  It makes such a difference!!  Additionally, they're less likely to be seated incorectly because the magnets automatically pull them into the correct position and hold them there!