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This shift knob is one to improve the driver's experience by adding some more character to the interior while maintaining the functionality of a weighted shift knob. With an 11 mm hole at the bottom, all that the driver would need is a rubber band and to follow the instructions above and he/she shall be on their way. Please note that this is to fit over a 10 mm male end. ( it's recommended that you upsize. For example: if 10 mm end, then get the shift knob consisting of the 11 mm hole.)