This Wilwood 18mm spindle washer kit listed for Miata applications includes the locking washer specified as 16x1.260 for use with the spindle assembly. Provided to match the listed application, the washer helps retain the spindle nut and maintain correct preload on wheel bearings during front-end assembly or service on compatible Miata models.
Wilwood Spindle 18mm Washer Miata LOCK 16x1.260