High-density polyethylene trays add extra leak protection to shelves or cabinet bottom. Constructed of 18-ga. all-welded steel with double-wall design. 1-1/2"W air insulation space and 2"H leakproof spill well. Choose Manual or Self-Closing Door models. Self-Closing cabinets have doors that are designed to close automatically when temperatures reach 165°F. Shelves are adjustable in 3" increments, letting you customize storage. 12- and 30-gal. models include one shelf, while the 45-gal. model has two shelves.