20 is then manipulated in order to insert the tabs of one set 24 28 in the desired apertures 32 in the post 12 of course initial height adjustment is provided by the selection of the apertures 32 to be engaged with the tabs 24 or 28 fine height adjustment is provided by reversing the bracket 20 i e rotating it 180 u00b0 about the longitudinal axis l and inserting the second offset set of fastening tabs 24 or 28 in the same apertures 32 note phantom line showing of bracket in fig3 since the offset is equal to 1 2 of the spacing of the tabs of the individual tabs sets 24 28 this allows a relatively finer adjustment so that the shelf spacing and incline of the shelf 18 of the gravity flow rack system 16 may be better adjusted to provide the desired forward feeding action of the merchandise carton c after inserting the desired fastening tabs 24 28 of a bracket 20 into each of the upright posts 12 of the framework 10 one bracket is secured to each post in a position to hold a shelf 18 at the desired height and inclination the shelf 18 is then secured to the brackets 20 by engaging the side frame rails 29 in the channels 23 at the top end of the brackets 20 see fig2 this completes a relatively simple and fastenerless connection in a relatively short installation time in summary numerous benefits result from employing the concepts of the present invention the bracket 20 of the present invention is essentially universal allowing easy.