New Age Industrial Heavy Duty Utility Cart with all welded frame construction consists of 1" x 1" x .070 wall extruded aluminum tube.   All Heli-arc welded with seams welded (no rivets). Hi-tensile, corrosion-resistant, rust-proof, primary extruded aluminum, Type 6463-T5 alloy. Each shelf is constructed of a .080 aluminum sheet with three 1-¼" lips (full 1-¼" hem) up and one full 1-¼" hemmed lip down. 3 solid shelves with three sides up and one side down with 540-pound capacity per shelf. Handle is constructed of ¼" x 1-½" aluminum strap welded to the frame uprights with round tube handle bolted in place. Four 5" diameter platform type casters with non-marking wheels; two swivels, two rigid. Construction Warranty: 5-Year Warranty. Material Warranty: "LIFETIME" Warranty Against Rust and Corrosion. NSF: Yes.