TRINITY’s NSF certified 4-Tier Black Shelving Rack will make any space organized – your office, your home, your kitchen, or your garage. Assembly requires no tools, and uses a slip-sleeve locking system. Shelves are adjustable in 1-inch increments, and allow for personal configuration. Entire shelving rack can be fixed with adjustable feet levelers or turned into a mobile unit with swivel casters. Unit also comes with 4 frosted clear shelf liners.