The smaller end fits 7-spline nipples with a 6.4mm outside spline diameter. These are found on all R-sys wheels and on other Mavic wheels from 2011.
The larger end fits the 6-splines of the 9mm outer diameter threaded eyelets found on rims such as the Mavic XM819, EX823 and Speedcity wheels. (This is the same size as the Mavic M40630 wrench).
Shipping Weight: 78g.