shelving: spacing of rails?

I have recently installed some twinslot shelving in total 5 one meter length uprights at a spacing of 600mm centres

I managed to find the studs which turned out to be 400 spacing and closer than I really needed for 25mm shelves No real issues although the

twin slot shelving ideas Height and shelf spacing adjustable Timber or Steel options depending on your requirements; 32mm pitch twin slot bracket for wall mounted twin slot uprights

twin peaks slot machine The uprights have a 32mm vertical pitch spacing, for a wide range of accessories Twin Slot