Railway accessories, Screw spikes, Tirafondos, etc. 1.Type: All Kinds 2.Grade: 4.6, 5.6, 8.8 3.Surface: Plain, Black, Zinc Railway accessories, Screw spikes, Tirafondos, etc.1.Type: All Kinds2.Grade: 4.6, 5.6, 8.83.Surface: Plain, Black, Zinc screw spike