For use only with White Industries cranks (because the spindle pattern is proprietary to White Ind. cranks)
The “MR30” interface means it will fit on to any of White -30 cranks, like the R30, G30, or M30s. The ENO interface works with their square taper cranks the ENOs and VBC cranks. For the 1x rings make sure you get the correct off set, boost or non-boost!