Dragon Stone Wheel Nut Sockets - CombinationDucati combination front and rear wheel nut socket: 55 mm 12 pt for rear wheel 28 mm 6 pt for front wheel Confused by 12 point nuts? A 12 point nut is simply two hexagons overlaid at 30 to each other. The size is measured exactly the same as a normal hexagon nut across the flats of the hexagon. Take a look at the diagram to see how to correctly measure and size a 12 point nut.