Most of two-color handles are made by rotary axis plastic injection moulds. Rotary axis process or rotary core process means that the two-color plastic injection mould won't rotate by injection machine, however, the cores of mold will be rotated by injection machine or cylinder of injection mould. When the injection part will be made the second color, the controller of injection machine will deliver signal of core pulling system to rotate the 1st core of mould to second position of core, then make the second color injection.