a clip structure for the assembly of concealed grid runners of a suspended ceiling structure , in which the clip is constructed for engagement with a supporting structure such as a flange portion of a suitably supported mounting member , for example a z - shaped runner , or from the flange of an existing grid system which is to form the support for a new ceiling structure therebelow , in which the clip comprises a mounting structure therefor and a runner - supporting structure integrally connected therewith , the mounting structure being adapted to be engaged with the supporting member which is to carry the same and having the supporting structure extending downwardly from the mounting structure . the latter is provided with a t - shaped notch therein which extends to the bottom edge portion of the mounting structure with such t - shaped notch being proportioned to receive the upper edge bead structure of a runner and interlock the clip thereto . the clip thus is slidable along the supporting member carrying the same with the runner to be supported by the mounting structure likewise being slidable relative to the clip whereby no preset dimensions are involved with respect to either locating the clip on the supporting member or the runner with respect to the clip .