These are the Hot Racing optional CNC Aluminum link arm for the Tamiya 1 14 scale R C tractor truck models including the King Hauler Grand Hauler and 470 620 Chassis This replace stock Tamiya Part number 10005472 Part F7 F6 Use Tamiya Instructions for installtion Features . Replaces stock plastic link arm. Greater rigidity for improved steering response Includes . One Set of Aluminum link arms as in the picture four arms in total Specifications . Material Aluminium