HO Gauge Model Train Wheels, 16 Pieces + 2 Sets of Self-Made Bogie Trucks These small-diameter (8mm) wheels are perfect for streetcars, narrow-gauge railway vehicles, and the bogie trucks of freight cars. The bogie trucks are self-made using a 3D printer for classic passenger cars. The axles are embedded with cut-out 2.1mm (inner diameter 1.65mm) brass pipes (C-pipe OP-577) made by Wave, ensuring smooth movement. They are included as a sample to utilize the wheels. If cutting out the brass pipes for the axle bearings is troublesome, KTM's axle bearing metal planes can be used. 【Specifications】 - Type: Model train wheels - Quantity: 16 wheels + 2 sets of self-made bogie trucks (20 wheels total) - Material: Metal wheels (axles are plastic) - Wheel diameter: 8.0mm (as shown in the photo) - Axle width: 23.2mm (as shown in the photo) - Axle diameter: 2.9mm in the center, 1.4mm at both ends (as shown in the photo) Please note that the tracks shown in the photo are not included. Thank you for viewing. Vehicle type...Optional parts Type...Wheels