Tool tray for ladders

A tool tray for mounting on a step ladder having a top step with a front side and a rear side and having a broad top surface disposed horizontally when the ladder is in open and operable position, comprising,

• an integral, one-piece device having a longitudinal direction and with ends and sides,
• the device having an outer end and an inner end, and including a basket at the outer end and a main hook at the inner end, and the device being made up entirely of the basket and main hook,
• the device being capable, together with other identical devices, of forming a stack with the baskets in a vertical tier,
• the device oriented substantially 180 degrees relative to adjacent devices when stacked,
• each basket including a polygonal loop and a single central bottom rod below the loop,
• the loop at each of two opposite sides having a hook member extending laterally outward from the loop, a socket extending downwardly from an end of said hook member distal from the loop, and a post extending upwardly from said hook member distal end,
• whereby the respective sockets and posts of adjacent devices operably interengage, and are operable for maintaining each two adjacent devices stable against the tendency of the basket to rock about the bottom rod.