The thread pitch is 8mm, 10mm, 12mm (which are all inside one shift knob to fit most manual cars). To install, simply twist, loosen, and remove the stock shift knob and replace with this LED shift knob. The LED are powered by an internal battery source which is rechargeable. (In the meanwhile of , the light colors change automatically). Activates when it detects touch with your hand on the back, providing a soft glow for clear gear position visibility even in dim conditions. Specifications: PRND+-Automatic Compatibility: Fit for most manual Cars vehicles(In reverse gear,there is no lifting or pressing gear knob operation), some Automatic( without buttons and locks) (NOTE: Please check on your car model details to confirm if this item is fitted) Color:Blue Crystal Shell Material:ABS Package Contents: 1 * Crystal Gear shift knob Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.