Compartment boxes are made with prime cold rolled steel for strength that lasts. Storage boxes include high impact styrene inserts to separate container into compartments. Each compartment has a scooped bottom for easy parts removal. Lid features full length piano hinges for rigidity. Positive locking pull-down catch keeps lid tightly closed to secure contents in compartment. Storage boxes measure 18"W x 12"D x 3"H overall. Gray powder coat finish.