They're extra hub provider components for the TRF420 racing vehicle framework. These are typically a greater and more durable design set alongside the previous design found in the TRF417/418/419 age of automobiles.
• TRF420 F Parts x1
• Components are molded in carbon fiber-reinforced plastic for superior rigidity.
• The design ended up being revised designed for the TRF420 chassis, with greater resistance to shocks and crashes.
• Upper and reduced flanged pipes are actually identical.
• to be used with 3mm diameter shafts (sold in Item 51637).
• suitable for cars using Item 51639 TRF420 D components (Suspension hands).