Set of 4 replacement wheel hubs to fit 1/8 scale models. This set includes hubs nuts and pins. This set does not use grub screws to secure the pins in place. When the wheel is over the hub the pin will be held in place.Inner diameter measures 8mm.Length of the hub 13.3mm.17mm hub measured across the flats.12mm across the threads.Pin measures 2mm diameter x 18mm long