Shift Knob Adapter M12 x 1.25 (threaded part) I am selling this because the hole in my car's shift boot was too small and it wouldn't fit. Therefore, the 10mm conversion adapter shows signs of use. Length: 5.7cm Width: 3.4cm, under the umbrella: 2.9cm - 3.0cm Conversion adapters: 8mm, 10mm, 12mm How to install: Insert the conversion adapter into the hole and screw it into the car's shift knob, then tighten with the included screws. If you have any questions or concerns, please feel free to comment.