Parts trays are useful to many companies for storing parts that need easy access, whereas Counter Display Trays are a bit fancier and are used for displaying goods on counters or at point of sale.
Parts Tray Self locking on 2 sides (front and back)
CDT Vertical Front Counter display tray with a vertical front. Self locking on 4 sides.
CDT Sloping Front Counter display tray with a sloping front. Self locking on 4 sides.