"STEEL BAR,3/8 IN. THK,1-1/2 IN. W,36 IN. LG,7/8 IN. DIA HOLES,SPACED 12 IN. ON CENTER ALONG CENTERLINE STARTING 6 IN. FROM EITHER END,USED FOR ATTACHING RUBBER FENDERS,RF1,TO BOW,STERN OR SIDES OF PONTOONSTRUCTURES,NAVFAC DWG 816467 MK NO. RF6,MIL-P-19380"