Robust. First make sure you measure the length of the studs. These jam nuts have a closed end that is over 1/4 thick. Typical cleats only have a thin, closed end, allowing more room for a longer cleat. This is not the case, so be careful or you risk twisting the bolts with nuts in the hub because they hit the ground. They look like deep style lags, but they aren't. In general I should have asked questions before buying and measured the depth of the lug and compared to the length of the lugs before tightening.