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This is a fret/sprue of truck frames and bolsters for Sn2 diamond arch bar trucks. They have as scale 4' wheelbase and require Micro Trains/Kadee HOn3 wheelsets to complete. The fret of parts makes 8 trucks, enough for four cars.
Assembly can be done using ACC, epoxy or by purchasing self tapping 1mm diameter x 3mm long screws (available in bulk from China via ebay).
Also recommended but not required: Purchase a #000 60° combo countersink/center drill (ebay, expect to pay about $12 for one) to use to clean up the bearing surface (that the axle turns in the truck frame. This will ensure that the wheels will run freely in the truck frame after assembly. Failure to clean out the bearing surfaces in the printed truck frame will result in unsatifactory operation of the trucks.