"MOVEABLE BRACKET ASSEMBLIES CONSIST OF ANCHOR SHACKLE,TEE WITH HOLE IN VERTICAL MEMBER,SCREW PIN,2 U SHAPED BRACKETS AND 2 1/4-28 UNF BOLTS;2 25 FT. LANYARD ASSEMBLIES CONSISTS OF 1/8 IN. NYLON CORD WITH SNAP HOOK (NAS 1282 CB) ON EACH END ATTACHES TO THREADED CHAIN CONNECTION (MCMASTER CARR 8947T15); STOP BOLTS GO THROUGH FLANGES AT EACH END PROVIDE SAFETY STOP; I BEAM MATL ASTM A242 HIGH STRENGTH LOW ALLOY STEEL; ANCHOR SHACKLE MATL FORGED ALLOY STEEL AND MEET REQUIREMENTS OF FED SPEC RR-C-27LB"