bases 14 c 14 e to provide for minimum viewable profile the similarly constructed collapsible safety rail assemblies 12 a 12 d each includes opposed left and right end posts 16 and 18 a top horizontal rail 20 extending from the left end post 16 to the right end post 18 and a bottom horizontal rail 22 extending between the left end post 16 and the right end post 18 an accessible instruction storage tube 23 is located on each bottom horizontal rail 22 individual pivot assemblies designated 24 a and 24 b as described in detail as pivot assembly 24 in fig2 are located at the ends of the left and right end posts 16 and 18 nearest the bottom horizontal rail 22 respectively of each of the collapsible safety rail assemblies 12 a 12 d a slotted tubular base 26 fig2 which is stationary is located at the lower region of each of the pivot assemblies 24 a and 24 b and secures in the bases 14 a 14 e as later described in detail fig2 is an exploded view of the pivot assembly 24 multiply designated as pivot assemblies 24 a and 24 b in fig1 in relationship to the lower portion of an end post 18 the pivot assembly 24 has major structural components including a stationary slotted tubular base 26 and a pivotable multi radius mounting fixture 28 and also includes a pivot pin 30 and a detent pin 32 having a spring loaded ball 33 the latter of which is secured to the slotted tubular base 26 by a lanyard 34 and ring 35 also shown is another locking pin 36 including.