They are solid cast, not hollow and have loose roses to enable them to be used with a rim lock (discard one rose) or use with a mortice lock.
They have threaded spindles to take adjustment for various door thickness and lock firmly with a grub screw. The GRUB SCREW should locate on the ''V'' in the shaft and not on the threaded part.
Each set comes complete with fixing screws & threaded spindle.
Knob Diameter: 55mm
Rose Diameter: 52mm
Spindle Size: 8mm threaded