This is a set of 8 axles for HO-scale model railway wagons, in two sprues of four. The wheels are 3-hole disc style and a scale 37.5" diameter (3' 1.5"). The distance over pinpoints is 24.5mm, back-to-back is 15mm, and the fronts of the flanges are 16 mm apart: a little inside HO track gauge to avoid riding up on curves and points.