This low friction fairlead is suitable for mounting on mast, boom and thin wall with no access from behind. Aluminium made, hard black anodized and highly polished to guarantee minimum friction. 3 sizes with 14, 16 and 18 mm holes for lines up to 10, 12 and 14 mm max. Just drill a hole of appropriate size (30, 35 or 40 mm for the different models) insert the fairlead into this hole and fix it with two screws (included).