This is 3D printed bracket for the LCD display (model KTLCD3) used in Sondors eBikes (Fattie, Thin, and Fold). You will need 2 rubber bands (included) to strap it onto the handlebar. If you plan to mount the bracket at the center of the handlebar for the Fattie or Thin you will need the 31.8mm size. For Fold or Fold X you will need the Fold 25mm mount.  If you are going to mount the bracket near the end of the handlebar or on an 22.5mm extender then you will need the 22.5mm size.