Tetsu platelegs are melee tank leg armour made in the player-owned port minigame. It requires 85 Defence to wear, and 90 Smithing to make in the port's workshop, using 50 plate and giving 20,000 Smithing experience.
The tetsu platelegs lasts for 60,000 charges of combat before degrading to nothing - it cannot be repaired. Equipping the platelegs will cause it to instantly degrade and become untradeable, even if it has not been used in combat.
When dying in the Wilderness or an unsafe PvP encounter, the player who kills the owner of the Tetsu legs will receive the Tetsu legs, with the same charges it had when owned by the player who was killed.