Shelves with special upward pointing outer edge serve as trays. Trays are useful e.g. in chemical storage cabinets or in cases where things falling out of the safe could cause damage.

These trays collect or even permit e.g. effluent and dripping paint or other chemicals.

The upward flange serves to prevent the user to yank the dish onto themselves and to hinder the drain or fall of the accumulated substance.

Pull-out versions.