A tool cart assembly including a tool cart having a horizontal surface defining a mounting aperture, a first rail including a bottom wall, a pair of opposed sidewalls, a front edge of each sidewall defining a catch, and at least one projection depending downwardly from the bottom wall, the projection being configured to be received in the mounting aperture such that the first rail is secured to the horizontal surface. A tool kit includes a sidewall and a first elongated rib, the elongated rib is configured to be slidably received by the first rail. The tool kit is removably secured to the tool cart by positioning the elongated first rib in the first rail and sliding the tool kit rearwardly such that the catches defined by the first rail engage a first portion of the tool kit.