and a mounting portion 84 of one of the mounting assemblies 66 a 66 b 66 c by a plurality of mechanical fasteners such as screws 82 as described below in the illustrated example the runner rail 58 and the mounting rail 62 may be provided as multiple pieces spanning different lengths depending on the distance between vertical frame members 20 from which the sliding rail assembly 42 is supported in certain other applications the span between vertical frame members 20 is significant enough that the reinforcement member 64 is provided to reinforce the runner rail 58 and the mounting rail 62 the reinforcement member 64 is provided an l shaped cross sectional configuration similar to the mounting rail 62 the mounting rail 62 is supported from the vertical frame members 20 of the frame assembly 11 by the plurality of mounting assemblies 66 in certain configurations the runner rail 58 may be mounted directly to the mounting assemblies 66 a 66 b 66 c and utilized without the mounting rail 62 and or the reinforcement member 64 as best illustrated in fig5 b an alternative embodiment of the sliding rail assembly 42 u2033 is shown as including the runner rail 58 u2033 and the reinforcement member 64 u2033 since the rail assembly 42 u2033 is similar to the rail assembly 42 similar parts appearing in fig5 a and.