Bin 4 deep corrosion-resistant polyurethane for use with the Flexi-Bin Cart. Exterior dimensions: 22.25 x 17 x 4 interior dimensions: 20.25 x 15.25 x 3.8. Includes 3 long (20.25) & 4 short (15.25) polyurethane dividers for partitioning the bin to securely