edge by an integral offset formed by an oblique narrow band 33 and a vertical distal strip 34 each end of the vertical leg 12 includes a vertical slot 37 open at the bottom and forming an integral vertical depending hook 38 a free end of the hook 38 has a beveled edge 39 leading to the slot 37 a juncture of the hook 38 with the vertical leg proper is interrupted by a small through vertical slot 41 that leaves a pair of land areas 42 and forming a vertical line of weakness 43 in the juncture the selected length of the stabilizer bar will correspond to the nominal spacing of a pair of main tees on which the stabilizer bar 10 is ultimately mounted one or two stabilizer bars 10 can be used on a ceiling panel depending on the length of the panel ordinarily where one is used it is located at mid length of the panel when two are used on longer panels they are located from an end of the panel at u2153 and u2154 of the panel length the stabilizer bar 10 can be fixed on the back side of an acoustical ceiling panel or tile of a low density type using the integral tabs 16 and 23 the final position of a stabilizer bar on a panel is illustrated in fig3 but their mutual assembly is accomplished before they are mounted on the ceiling grid first the stab tabs 16.