They are particularly useful for frequent heavy trailer loads. You can expect better axle shape retention and durability when using these reinforced parts. Hex and wheel nuts included.
Tamiya 120mm Axle, Trailers/Trucks) Greased Axle Shafts, Tamiya Quality
Tamiya 120mm Axle, Carbon Reinforced with Ball Bearings (Trucks/Trailers)
Tamiya 120mm Axle Casings for Truck Semi-Trailers, Carbon Reinforced Parts
Tamiya 3-Axle Reefer Semi Trailer TAM56319
Tamiya 56319 3-Axle Reefer Semi-Trailer For Tamiya Tractor Trucks 1/14 scale
