Dividers for Screwfix storage unit stock number 8445P compartments.
These dividers are roughly 50mm width x 30mm height x 1.8mm thick with a 2mm radius fillet on bottom corners. However, the bins are slightly tapered so the top of the divider is 1mm wider than the bottom.
If the compartment contains tiny parts like washers, put a dab of hot glue on the top corners to prevent any movement.
The author marked this model as their own original creation.