Akro-Mils 33226 Akro-Grid Slotted Divider Plastic Tote Box, 22-3/8 -Inch Length by 17-3/8-Inch Width by 6-Inch Height, Case of 4, Blue 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 40 lbs Dividers allow sub-division of the containers, down to a 1-1/4-Inch square compartment size Accepts up to (11) optional 42226 length dividers and (15) optional 41226 width dividers Made in the USA