That is a supplementary pulley synthetic component the TRF420 battle chassis unit. Use it to restore worn-out pulleys inside drivetrain to keep your automobile or vehicle operating efficiently and smooth.
• TRF420 37T Differential Pulley x1
• TRF420 Differential Case x1
• 0.2mm & 0.3mm Shims x2 each
• the most recent design not merely provides a weight cost benefits of 1.5g, and less oil leakage when compared to past designs.
• suitable for TRF420 and TA07 framework cars.