Your dishwasher's lower basket features plastic wheels on its side that allow the basket to slide in and out of the dishwasher.
When you notice the lower basket is not slide smoothly or makes squeaking noises whenever you move it, the castor on the rack may be damaged. These wheels can also be damaged by dropping a heavy plate or by not loading the basket into the dishwasher correctly.
If the runner on your dishwasher's lower basket has come off or is loose, the whole rack can become insecure and at worst it might fall while in operation and damage your dishes.
Use this replacement Lower Basket Wheel to ensure that your basket moves easily and smoothly inside your dishwasher, preventing slips and accidents.