Conversion bracket for attaching a commercially available 17mm ball joint compatible smartphone holder to the Beat Sonic BSA20 ND Roadster-specific smartphone stand. The extension bracket is made of carbon-filled ABS resin, and the angle adjustment part is 3D printed using carbon-filled PETG resin. Metal tapping screws are used inside the ball joint for reinforcement. The Beat Sonic stand requires combination with their own holders, but by combining this extension bracket, you can attach your favorite commercially available smartphone holder (17mm ball joint compatible). It is designed to extend upwards, allowing you to attach a holder. This is recommended for those who are concerned about the large amount of eye movement required with the standard holder mounting position, or those who are bothered by their hands touching the holder when operating the shift lever. ☆ Please use in combination with the following product ☆ Beat Sonic Mazda ND Roadster-specific stand (single item) BSA20 https://amzn.to/408Y1P7 ☆ Can be combined with commercially available holders such as the following ☆ Seiwa (SEIWA) MagSafe compatible wireless charging holder (single item) IMP302 https://www.amazon.co.jp/dp/B0D8T681XR/ In addition, there are many commercially available 17mm ball joint compatible holders, so please check your existing holder.