Specification: Item Type: Gear Shift Knob Material: Artificial Leather + Aluminum Alloy Size: Approx. 2.17x2.95in/55x75mm(W x H) Threaded Adapters Inner Diameter: Approx. 8mm/0.315in, 10mm/0.394in, 12mm/0.472in(Caliber M8, M10, M12) INSTALLATION STEPS: 1. Unscrew the original gear shifter knob to get it off from your gear stick. 2. Wrap a few turns with electric tape on your gear stick thread to keep tight if necessary. 3. Get off the aluminum alloy bottom cover of this shifter head and put it on the shifting rod. 4. Install the matching threaded adapter of black rubber sleeve on the shifting stick. 5. Screw the stick shift handle on the shifting rod with small screws by the hex wrench. 6. Rotating aluminum bottom cover into the the car shift knob and tighten all up. Make sure your original stick shifter removable. 1. Not suitable for the original car shifter with its own irremovable lock/function button. 2. For manual transmissions: Not suitable for the reverse gear of original car shifter needed to lift up. 3. For automatic transmissions: Cannot be installed for those cars with the reverse gear next to the 1st gear. 4. Wrap a few turns with electric tape on your gear stick thread to keep tight if necessary. Package List: 1 x Gear Shift Knob 3 x Adapter 4 x Fixed Screw 1 x Wrench