Smaller end fits 6-spline nipples with a 5.5mm outside spline diameter and 7mm thread size nippleCommonly found on R-sys wheelsEqual to the sizing of the Mavic® M40652 wrenchLarger end fits 6-spline 9mm FORE drilled rim adaptersCommonly found on rims such as Mavic® XM819, EX823 and Speedcity wheelsEqual to the sizing of the Mavic® M40630 or M40494 spoke wrench