Protect your boat's dock lines and rails from chafe with these stainless steel rub strakes.Polished stainless steel guards protect lines against chafe from cap rails, gunwales, etc.3/4", 1" widths; 8", 12", 18", 24" lengths. Material:Marine-grade Type 304 stainless steel Fastener Size Required: #8 for 3/4" size or #10 for 1" size; flat or oval headed fastenersWarranty: Five year limited warranty