Steel Royal: Cross bar nuts, retainers, kingpins, axles are all steel for strength. Sure Grip Urethane Cushions available and recommended. Adjuster nut is also the self locking nut which is common on other plates.

Snyder Skate Co. is a premium product, the best of the best for over 30 years.  Designs are copied the world over.  When you want the best it’s always been Snyder.
Snyder owner’s manual
Snyder axle distance chart