indicate various parts of such structure that are clearly common to both main runners and cross runners thus turning to fig1 and 11 the web w of either a main runner or a cross runner may be provided with a plurality of adjacent recesses or serrations 72 each recess 72 is preferably formed integral with its respective web and pressed out of the inner surfaces thereof adjacent the bulb portion b to extend downwardly and outwardly therefrom to a point between the upper and lower extremities of the webs recesses 72 on each web w are disposed for alignment with corresponding recesses on the opposite web to thereby define composite channels or tubular openings for guiding and receiving suitable fasteners or metal screws 74 as depicted in fig1 the arrangement is such that a fixture or a support s for a partition head channel or the like may be brought into engagement with ceiling tiles t and affixed to runner bulbs b by means of the sheet metal screw or the like 74 which is guided through the composite openings defined by the facing recesses 72 and secured through the bulb portion b as depicted in fig1 and 13 the present invention further contemplates the employment of a suitable means to maintain the thin line exposed grid appearance in the locations where the cross runners intersect the main runners to this end a clip generally designated at 76 is provided for removable attachment to flanges 16 of main runner 10 to substantially span the gap between the flanges 46 of adjacent connected cross runners 40 more specifically clip 76 is fabricated of a suitable resilient spring like material and has a pair of upwardly and outwardly directed snap fingers 78.