Roller lock

The U-shaped plier pack assembly locks a base plate on the tray to prevent the tray from moving or shifting during transportation. This design is designed to ensure the safety of large drums in "horizontal packaging" levitation systems. The U-shaped pliers are fixed on the slightly lower side of the floating floor to prevent the vertical release of the floor. The appearance of U-shaped pliers made baffles and nails obsolete.

Source: Packaging Expo