We call it the flexirack trolley. Many people use plastic or steel tote boxes or Eurocontainers or XL boxes or plastic storage trays. Trolleys can be made to suit the different heights of box but this trolley allows some flexibility in that the angle supports can be adjusted vertically to allow different heights of tote boxes to be stored in the same trolley and then changed as necessary if the box height changes. In order to have a fully flexible manufacturing storage solution surely it is desirable to be able to just change the pitches of the supports when necessary rather than buy a whole new trolley? Adjustable height angles on a tote or eurocontainer trolley.