Molded from clear polypropylene resin which permits visibility of contents. Heavy duty reinforced hinges and patented positive stops allow cover to be opened wide or remain in the upright open position making it easy to read content labels. Two positive snap latches keep boxes securely closed and prevent parts from migrating between compartments. Cover overlaps sides to keep out dust and dirt. 18 Compartments. 12 compartments of 2-1/16"W x 2-1/16"D x 2"H, and 6 compartments of 4-1/4"W x 2-1/16"D x 2"H. Optional rack available designed to handle 5 boxes. Sold in package quantity.