A tool box with vertically stacked monolithic trays. Each tray has pockets specifically shaped to receive complementary tools. The trays have upstanding cantilevered posts, which can space apart the superjacent tray. Alternatively, the posts can be received in complementary sockets of superjacent trays to prevent undue lateral movement while in the tool box. The post and socket geometry can be constructed to index the order in which trays are stacked and index how individual trays are oriented for optimal and sequenced access to the tools.