Advantage: Unique stylish design, becoming a fashionable decoration in your car, also enhanced shift feel and driving experience. Easy installation, just remove the existing manual gear shift knob, select right adaptor size and insert with the new gear stick handle. Widely Use: with three adapter sizes to fit various vehicle as long as the thread size matches. Specifically designed for vehicles with a stick, manual speed or buttonless automatic transmission shifters. Functionality: Type: Car Shift Knob Color: Blue Material: Aluminum Alloy Adapter Thread Size: 8mm, 10mm, 12mm Knob Hole Diameter: 16.6mm / 0.65"(D) Knob Size: 4.7x4.7cm / 1.85"x1.85"(L*W) Installation Steps: Remove the existing gear shift knob, measure the diameter of the screw rod. Choose one piece appropriate adapter from 3 pieces. (Note: If the three adapters are not the same size as the car screw rod, please choose the closest size of the adapters, fasten it with adhesive tape, then tighten the shift knob stick.) Put the adapter into the gear lever. Put the new shift knob head directly into the gear rod. Kindly Know: Please make sure your existing stick shifter removable. 1. If your MANUAL car reverse gear needs to be lifted, then it can't be used. 2. If your AUTOMATIC car reverse gear needs button lock, then it can't be used 3. If your existing gear knob can't be removed, then it can't be used. Note: Before buying, please make sure if your shifter thread is one of 8mm, 10mm, 12mm The size measured by hand, so it may have a little 1-3 mm difference. Package Content: 1 x Shift Knob 3 x Adapters