Ronstan's R374 Foresail Fairlead/Bow eye Fitting is molded from black, Acetal resin to provide maximum resistance to wear. It has a 1/2 in. (13mm) aperture and measures 2 3/4 in. long x 1 1/8 in. high x 11/16 in. wide (70mm x 29mm x 18mm). Its two holes are spaced at 1 13/16 in. (46mm) on center.