Full-extension ball-bearing drawer slides for smooth operation Four 50 lb load capacity drawers 500 lb load rating with four 4 in x 2 in casters, two lock and swivel Keyed internal locking system safeguards tools Non-slip open weave top mat helps protect the cabinet surface Non-slip open weave top mat helps protect the cabinet surface Full-width black steel drawer trim for grip All-steel construction provides strength and durability.