42""H PROTECTIVE RAIL BARRIER POST FOR DOUBLE RAIL - 436732 (C-2) THESE 4"" SQ. X 1/4"" THICK TUBULAR STEEL POSTS ARE SOLD INDIVIDUALLY AND SUPPORT 2 RAILS. BASE PLATES MEASURE 10"" SQ. X 5/8"" THICK AND ARE PREDRILLED FOR EASY INSTALLATION. HIGHLY VISIBLE SAFETY YELLOW FINISH. INSTALL OPTIONAL DROP-IN BRACKETS (SOLD SEPARATELY) TO POST TO ALLOW EASY TOOL FREE RAIL INSTALLATION BY SIMPLY SLIDING THEM INTO PLACE. TO SUPPORT A SINGLE RAIL CHOOSE THE 18""H POST. EACH POST INCREASES OVERALL LENGTH BY 4"". PLEASE NOTE THIS MODEL IS NOT COMPATIBLE WITH MODEL # 442594 442595 867100 867101 867102 867103 867104 AND 867105.