Smaller end fits 6-spline nipples with a 5.5mm outside spline diameter & 7mm thread size nipple Commonly found on R-sys wheels Equal to the sizing of the Mavic M40652 wrench Larger end fits 6-spline 9mm FORE drilled rim adapters Commonly found on rims such as Mavic XM819 EX823 & Speedcity wheels Equal to the sizing of the Mavic M40630 or M40494 spoke wrench