This is an HO-scale (3.5mm:1ft) model of a British Railways 16T diagram 1/102 mineral wagon, body only. It fits the HO-scale 9' wheelbase steel solebar chassis model I have also uploaded, but if you want to use that rather than a chassis of your own choice from elsewhere, I suggest you buy the model which includes body and chassis as separate parts, or the single piece model including chassis.