Set of 4 Beige Orbital Shepherd 50mm Castors (44) Threaded Stem
Set of 4 50mm Shepherd Castors
These have a M8 threaded stem so you can screw them into the frame instead of a socket or a plate.
These come as a set of 4 (2 x Left and 2 x Right castors)
Acetal (Plastic) Wheel