Model of central main support screw: M10; Dimension of locating pin of central main support: inner diameter 10mm/0.39 in, outer diameter 19mm/0.74 in, height: 9 mm/0.35 in. Side bracket footstool bracket screw model: M8 and M10. Flange nut model: M10. Applicable to moped electric scooter 50cc-150cc center main bracket/side bracket footstool bracket. Before purchasing, please compare the screw parameters with the above parameters to avoid errors!