The standard saddle rail width is 44mm and the rails are 7x7mm. Our saddle rail clamp is not compatible with oversized or oval rails. Ritchie makes different kinds of size rail clamps for our binder. 7x9 is for oval rails which are mostly found on carbon rails and 7x10 is for oversized rails which are not very common.
https://ritcheylogic.com/bike/seatposts/wcs-carbon-1-bolt-seatpost-clamp