This Tamiya factory replacement idler shaft fits the DT-03 and Hornet platforms and measures 5x45mm as specified in the title. The idler shaft is a core drivetrain component that transmits power through the gearbox, and replacing a worn or damaged shaft restores proper gear mesh and drivetrain efficiency. The shaft is machined metal construction. Features: 5x45mm idler shaft dimensions Metal construction Factory Tamiya replacement part Fits DT-03 and Hornet platforms 7/7/26 cs