Abstract: A locking device, for securing a toolbox with respect to a support structure, comprising a housing for receiving at least part of a ground engagement mechanism of a toolbox. The housing is configurable to have an opening, or has an opening, through which at least part of a ground engagement mechanism of a toolbox may be inserted into and removed from the housing. The locking device comprises a retaining mechanism that is movable between a retaining configuration, that prevents the removal of the at least part of the ground engagement mechanism from the housing through the opening, and a releasing configuration that allows the removal. The retaining mechanism comprises a retaining member that is movable between a first position such that the retaining mechanism is in the retaining configuration and a second position such that the retaining mechanism is movable to, or is in, the releasing configuration.