The locking casters come as a set of four and are made from black plastic with steel fixtures.
They have a small locking pedal so that you can stop your drawer system from moving around when its locked and when its unlocked you can pull the drawer system into a better position!
If you would like a set of locking caster sets, you will need a set for every drawer system you end up with, if you are intending to stack two frames you will still only need one set of casters!
Also, please be aware that if you do purchase a set of casters it will increase the overall height of your drawer system by 4.5" (11cm).
