Features: Easy installation, No any modification. This antenna is functional and intended for AM/FM radio signal. This product is intended to replace the extendable portion of the antenna. If your vehicle is fitted with factory Navigation / Mobile phone integration, please confirm the antenna to be replaced is for radio signal only. Installation method: the original long antenna is directly screwed down and the carbon fiber antenna is screwed on. Attention: This Item is For AM/FM radio only. Does NOT for satellite radio and/or GPS system. Please Do Not Buy if Your Vehicle Does Not Have Screw In Type Antenna) Specifications: Material: Aluminum + Carbon Fiber Insert Color: Black Size: Length: 12cm(4.72in) Quantity: 1 Set Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:(No retail package) 1 x Carbon fiber antenna 4 x Different Size Stud bolts (You choose the right one for your vehicle) 2 x Plastic Rings