Torx Anti-Theft Screw Spike | Internal Plum Blossom Anti-Theft Railway Spike Product Overview Torx anti-theft screw spike, also known as internal plum blossom anti-theft screw spike, is a specialized security-type railway fastener widely used on railway lines, suburban rails, freight railways and unattended track sections. Different from conventional hexagon screw spikes, this spike adopts a unique internal torx (plum blossom) anti-theft drive structure, which can only be