Castor sets

2 or maybe 4 swivel castors ?

Whether you use 2 swivel castors and 2 fixed castors or 4 castors, both versions have their uses.
If you need to travel long distances with a roll container, it is advisable to equip it with 2 swivel castors and 2 fixed castors, as the fixed castors provide a stable straight-ahead travel and the user does not have to constantly correct the direction of travel.
If you need to transport goods in narrow aisles (e.g. shopping trolleys in markets), the version with 4 swivel castors is the right choice, even allowing you to turn on the spot around your own axis.