Akro-Mils 33223BLUE CS 22-1/2 -Inch L by 17-3/8-Inch W by 3-Inch H Akro-Grid Slotted Divider Plastic Tote Box, Blue, Case of 6 Injection molded from polypropylene block copolymer which resists most solvents and chemicals Strong stacking rims and external ribbing provide added strength to hold up to 30-Pound Dividers allow sub-division of the containers, down to a 125-Inch square compartment size Accepts up to (11) optional 42223 length dividers and (15) optional 41223 width dividers Made in the USA